Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf25703f51dcc3b…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 16:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7800b05622fa5f195d700aaa2bfbfe11 SHA-1: 5a550d9dbd8d8d20c2ac66a3b95a9b148a54330f SHA-256: 3cf25703f51dcc3be86319916ec3e3f9b064871648ff88d0b05856a1497e8f4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/aws?utm_term=club+car+precedent+beige+seat+back PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382948/normal_60514d521dc4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6059e228342a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fdacb7c3081d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_60295c3d89d7c.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/tulerilajirixovomeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_601797087e43e.pdfIn PDF document text
    • http://fozivot.mypressonline.com/free_affidavit_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_6034056c8e0a8.pdfIn PDF document text
    • http://creditactive.info/19204123989bq5eg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fdad447d7fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_604b7034d99f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5feebe3c24faf.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/769649.pdfIn PDF document text
    • http://nakanilo.club/714082669212vxm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_602665cd39b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_600f9d4be6731.pdfIn PDF document text
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/suzasinigab_kotememo_dadajewus.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/zetomes.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/miwagutevofara-ganawa-tonewajo-pixupurovim.pdfIn PDF document text
    • http://sputnews.com/97606692762w8r4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukosivujuxu.atwebpages.com/58092637775.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/format_for_job_application_letter.pdfIn PDF document text
    • http://zapusov.atwebpages.com/bascom_avr_manual.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_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 5348 bytes
SHA-256: e543430d13972fa295da16c94f5c1cea2cdfabb1f754ee136ddd7d39688fecba
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10832 bytes
SHA-256: 8350be2d1aefb517af62752e78374b0263d85f197bf7473d4134ae2bddc17d33

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