Malicious PDF — malware analysis report

Static analysis result for SHA-256 0944efae97b809a6…

MALICIOUS

PDF

81.7 KB Created: 2021-03-27 15:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f72e4c9f35521ebe86536ea68c03b689 SHA-1: 246cf4cbce576b1ea08cbf844b835c4c5b31bf24 SHA-256: 0944efae97b809a60d655ae30cc957c6c7fae7e9bc23327f9fb426dc530a75a7
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=wood+carving+tutorial+for+beginners+pdf PDF link annotation
    • http://rejorevubirobu.sportsontheweb.net/advanced_sports_nutrition_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_600532a01ee93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_60582056f22d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468843/normal_600df4845cf19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_605d89bed4b0c.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/1163959057.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/petowezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_61baa623be084b8d8a0a3c602345f0f0.pdf?index=trueIn PDF document text
    • http://tubupokus.rf.gd/nexoxuxadiwizubademop.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_6e11fbbd33044c8e9773554893f3f2a4.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_e10809f9f3724fafbb455811aa097f5c.pdf?index=trueIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_0cb86bfe565d4c91b26059325106209c.pdf?index=trueIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/2020_monthly_calendar_printable.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_0f298d1449a744c4ba83a4e9c63beb55.pdf?index=trueIn PDF document text
    • http://puvuxidaw.epizy.com/advanced_javascript_book.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_756cc41e3c51480b96ce6de9f6e631e8.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_a3ed7939fe844fafbda5325d9dbfc09d.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/nodipiwadivoleze.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_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 5536 bytes
SHA-256: d48d35d9ff970e52b3617dd8c2790cc62a53f4af6c99993feef0901e78a6c08c
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 10872 bytes
SHA-256: c1dc6dc954f62cd0252515baab0447536861705669a4d766e6936802d56a7d40

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