Malicious PDF — malware analysis report

Static analysis result for SHA-256 665b98ee212689f1…

MALICIOUS

PDF

83.8 KB Created: 2021-05-10 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48d2af59bde074a007d9708622d44a7e SHA-1: a36b5af658dec06d63da62e1d7750fc2faef034a SHA-256: 665b98ee212689f1dfc39a5020fb272ad2f4107fa1c420fa6fad0ba2fdb942bb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links hosted on disposable domains, suggesting malicious intent. ClamAV detection and ML classification further support its malicious nature. The document body, though heavily obfuscated, contains text that could be interpreted as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=le+guide+culinaire+first+edition PDF link annotation
    • http://svarka-aurora.online/komuvapiacw8q.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/7333290.pdfIn PDF document text
    • http://sdek-24.cc/5e_modeline_gre_ders_plan_rnei_ilkokulxs9e8.pdfIn PDF document text
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/kesomemivexulev-teseba-libotu.pdfIn PDF document text
    • https://suvosimi.weebly.com/uploads/1/3/4/6/134688706/volugerenam.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/solvency_and_liquidity_test_templatehzbvr.pdfIn PDF document text
    • https://duvarifa.weebly.com/uploads/1/3/5/3/135347264/9658154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poresiz.epizy.com/79461543313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c60087d-dacd-45a8-a1f0-8355450de03f/10550166301.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_ef2fe3fa95ee42cfaf45ca7af673f9ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/564ab48b-c892-4dc6-871c-c277c3dfb27d/tamomafumix.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_2cd91cc05b294dbb9768d02a7bbaa004.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8cc2e5-426d-4fd1-a8e1-23962a1325ae/math_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13006e3-c93b-4e54-a0fc-7ab4943c3b5a/dipapu.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_72ecc1a432b0461aaca459548ee27f49.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_2714b58395f54bf1a85c621e8c18e01a.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_f8924ec9caeb43fc951f4a2f0d08a3ba.pdf?index=trueIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_f181cc8cd08443ecbe7ee2066c7d8cc1.pdf?index=trueIn PDF document text
    • http://mugoxox.epizy.com/quashing_of_fir_after_filing_chargesheet.pdfIn PDF document text
    • http://togalufunepobaz.rf.gd/33558235896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2bc4da-5cde-438e-ac62-3feca35ab3eb/fafom.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_10e47f9008854e1398d5e6c80e849868.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_e1b31eea58614d809513e1d7b2a98c29.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 5132 bytes
SHA-256: 04636e0a60ee7fc2fa7b628c0692b39bfa6c55236df65fa3c66b9b88088573f4
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 13240 bytes
SHA-256: a63c436f693a3dde19480e1e60c5e714f0523bb5c7c3a1bd213f2617fe5af385

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