Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c3f24e348eaf7…

MALICIOUS

PDF

72.2 KB Created: 2021-03-22 05:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e768187daa01a21741407650b013bf86 SHA-1: 20d64c4401d3f6b5efd879bcb0d57dcc15af7551 SHA-256: 128c3f24e348eaf7f46ff543a96e637c31053ab1814ecbab9deba32f59b45c16
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=louisiana+purchase+and+western+exploration+worksheet+answers PDF link annotation
    • http://zolepop.mypressonline.com/potassium_chlorate_strong_or_weak_acid.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/civ_6_gathering_storm_sale_steam.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/ross_carbonite_black_ndi.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/28250340868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdb8b3a-f0a4-4520-9a9f-2a1eb19cf77e/zebapebuzolalamodaga.pdfIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_41951aae2814439da96c6f0f50c58f8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bbf9bc-06ca-4631-82b9-6a823e329ba4/jbl_xtreme_2_waterproof_portable_bluetooth_speaker_-_black.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_83f87c85b81a462b844c2556a58dd031.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7e1643-bc6b-4c3d-932f-b9e40612c510/66872424888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c988b24-c645-43b6-8753-5f082325b962/29610535603.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_b26fb9e78a8f48818fb821372aaa14c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27892f86-783f-432d-af3f-77f3b8040ce2/meaning_culture_of_excellence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa4427d-b4a0-4b3e-bde6-3a7fa7204be6/noleginufenatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6a2c21-9ace-4b60-910b-34c1da7d3470/to_kill_a_mockingbird_movie_watch_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0736cce3-f536-4016-a439-13a31532bd12/how_to_clean_the_keurig_k_elite.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_f86a4788e13541de824ca97c3d9e61c9.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/dibefepawemava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937defc1-4a06-4713-a13c-33cbdd238365/engineering_materials_book_free_download.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_c3f98b5443a44ee0af0134380bccdf1a.pdf?index=trueIn PDF document text
    • http://xijejuvi.myartsonline.com/indoor_air_pollution_definition.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/gituwapefixujibemup.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.pdfIn 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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 5324 bytes
SHA-256: 6667f910b81f6e953952adef8d352ff30bf0e1d10a24f4afb06bfa92db08e814
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10476 bytes
SHA-256: 3c2c0db42a1dcbe9f00f162e14954fe9ef42138a30b7e9f11bf4b605bd67d55f

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