Malicious PDF — malware analysis report

Static analysis result for SHA-256 36097fc71dfa3e04…

MALICIOUS

PDF

68.4 KB Created: 2020-11-10 17:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b5ebe6e448ee79caf34067a39f45cbd0 SHA-1: 183bf43317069a1ee42c9ef16b27643611b91097 SHA-256: 36097fc71dfa3e0443246b34cfd96e825afd706e44faecd3981165707ec625ce
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external links and the heuristic firings for PDF SEO link farms suggest the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?keyword=manual+for+gourmia+air+fryer PDF link annotation
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/legazigoxadazadodori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5f9b9b4be57c4.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/repaxolugebup_mabilebopivusad_purekesuvuj.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/temezug-pogudajuwo.pdfIn PDF document text
    • https://durewisopugus.weebly.com/uploads/1/3/4/3/134369166/ad2eef061806b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f871ee44eb9f.pdfIn PDF document text
    • https://pamarilu.weebly.com/uploads/1/3/4/3/134322341/tetitubule.pdfIn PDF document text
    • https://bemogipe.weebly.com/uploads/1/3/4/3/134379528/59f2b9de36996a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fa5158bc0f0f.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/9a05c67.pdfIn PDF document text
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/8075027.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/fe8ded961d9dda.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/ramotar-ditik.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/0de546cc-c472-4d73-9d13-25491ebae2d4/smash_bros_melee_save_file_dolphin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6be828-5207-4ddb-b898-475bb44abdbc/60318795752.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_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 5016 bytes
SHA-256: fccb97abc2442db2547e27744c1e23010d44a88b254162709c70424b34eb4118
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 10792 bytes
SHA-256: 3fe3f9a9f3fe216bdaabc84a408bd3ef9639b98a249fac9ebbf4cc41eb6a20c5

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