Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50afca0a332da5a…

MALICIOUS

PDF

89.6 KB Created: 2021-03-23 06:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d6e30ab8cf0b143466272334ba7a309c SHA-1: cb8551e148be2e009554fe175b6fef556b8559b7 SHA-256: c50afca0a332da5a138e63c7545dce0656f05e4c3241686e5cace5dda77478b6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mezovuduw.ru/strik?utm_term=lewis+structure+atoms+worksheet+answers PDF link annotation
    • https://ponigeje.weebly.com/uploads/1/3/0/8/130874529/vimasav_gosipabab_zudajuge.pdfIn PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/xukoviselonu-fusubugojezavuf-teguxif.pdfIn PDF document text
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/soxuvix-lezebar.pdfIn PDF document text
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/8b620413b6c4d.pdfIn PDF document text
    • https://jofetafoba.weebly.com/uploads/1/3/4/4/134485710/29cffc481.pdfIn PDF document text
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/2223a3.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/pukitix.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/0795cc64cc1c.pdfIn PDF document text
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/rebaz.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/5848878.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/768e49f0-57e9-4425-94e6-197e9cf267cf/examples_of_food_safety_hazards.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_dcc4df8fdeaf44ef891c9b7024061c76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/185da3bb-3403-4771-bdbe-6b1c5f8c8db3/3224544104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a40ff3-e492-4e0c-b4e7-94a40cd3216c/nitro_pro_9_crack_32_bit.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_2c6b114822f846bb9f0c6130d948e507.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_45acea6515a947c198048c6abbae9ddb.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a789c7a31a0b46ccaded7a690e782dd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6833d7bf-4f8e-45ed-b6a0-dbc53eda787e/78309913343.pdfIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_cf570584049141b5a1196161a840abf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b0538a-cd42-413d-9d7a-bb4cff737beb/asus_rampage_v_extreme_m.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c402c5e6-5794-4604-a11e-330f6fcf3bd0/how_much_can_you_increase_rent_in_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10179ce-00d1-4f67-976b-8395f2e83831/47871103016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21990c5-1a14-4272-86ab-95ee476cb2c2/boroxovamedimatid.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_9108ba568fb740239428f2d58581b62c.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_e71e36bf7a554a2cb122f37fd46a1510.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/476c6cb2-7a6a-4f4a-8c50-b5075269380c/what_is_corporate_identity_and_branding.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_fbaf91befa5641919a2094484131f8d8.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_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 5104 bytes
SHA-256: 951c786569a313c9d33135878b57fe49c4fa2966a2b2670320fbaca2b8196034
font_01_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 11920 bytes
SHA-256: 3d859d799e162369a58a063bd6fa1599b9ffe86a5fd3c79d2a09832afd879919

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