Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a12b8973ced2b10…

MALICIOUS

PDF

144.8 KB Created: 2021-03-30 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 885cfb53c90a4bbd1bdb2a2bc8a95399 SHA-1: 545a392763eea134a5d8c718b5c0e6385fca2223 SHA-256: 9a12b8973ced2b1039216b05eee87dd9a22386c77af941c20e5faaef01aa1aef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is https://kuzutuzo.ru/strik?utm_term=true+love+quotes+in+hindi+for+gf, which is likely used to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9376

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=true+love+quotes+in+hindi+for+gf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409409/normal_6041ac5368d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_603b28ca6a9c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_60481bd50cb5a.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/trigonometric_and_analytical_geometry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6038131d79f47.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/aesop_s_fables_morals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_a0668eeb0338498d99679ba61d5510b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/top_10_android_phones_companies_in_india.pdfIn PDF document text
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_a35c43e316ba450292250f96cca28252.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_97e15418d7e648749b0495ad8fcc52af.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_e98d26d7ce40422d85b3b77c3c916ae7.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_edf17058b85b450388b893c402ec4cf5.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_e56b1d1c04144c4a81c6971eedcc40a0.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_51990d6b82574a9ba586fe7ebdeb9086.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/kuvemixobexisu.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_ba849953c8fa41048fe0fe8eb67a1294.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_78d1f80b867b43e6a1c45266f19b2a73.pdf?index=trueIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_e8a41403e6f9487ea3d28dd8f92b00c9.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_9274e85721a94f41af926b21aca144d4.pdf?index=trueIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_ccc8a67b2593459ba1e7359d3edd8a7a.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_f2bb7db592bf433b945f9471b009d817.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 6476 bytes
SHA-256: 526c5a2175551476bef9e67e23fc16d118bda5f5d89964818a68e3a853678add
font_01_sfnt_off00014131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 5092 bytes
SHA-256: 899795c08c2b5160fe6aa98893d039604993379e63d4718d5ff407fc7738885a
font_02_sfnt_off0001527e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_03_sfnt_off00015dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 27232 bytes
SHA-256: 9b96e120ec6a8474b2d8c1706deba3316f6a9ff0098c17b397c3ed8dc22606db
font_04_sfnt_off0001aa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA72 7612 bytes
SHA-256: 04f3f0719a7b081d40dcce82454d4c5951eb4b9c89696f419ff6e1974e42b499
font_05_sfnt_off0001bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF75 11564 bytes
SHA-256: 8695aec7fd9d281c2621ecb45e5e860c594252c3297d8bf19fcb6b3e93652126
font_06_sfnt_off0001e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6F5 21348 bytes
SHA-256: e2ed366fcdd54364dbf00965e65b96874ed1d39107936baa81f16cb6c39a1e80
font_07_sfnt_off00020615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20615 15972 bytes
SHA-256: e8ae76aac3c8abafec75d380983fdf79dcdd39db952db1684b827dfc584fad48

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