Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aafbef7c54fa2a…

MALICIOUS

PDF

69.8 KB Created: 2021-05-23 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c15324b5124bd66251ffcbaf3ab270d2 SHA-1: bdf0dfc2f7bfebd9ff08eb3673cf3132336514a6 SHA-256: f3aafbef7c54fa2a3a2de2619b2e4d913139481c9f68d83d708a2f8a7cea7ecf
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 0.9997

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://nipisod.ru/strik?utm_term=gayatri+mantra+anuradha+paudwal+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601bb33c9320a.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/9d4c1be87e053.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/abf9917e.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/wosuxajaxev_balajokiwumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5ff1c3d6b3582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_6069dc18c657e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6037807a9eedf.pdfIn PDF document text
    • https://lunogowome.weebly.com/uploads/1/3/4/8/134859941/4361b16870a08.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/1438848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_606b557acd723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5fe04f122e0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_60166da64fae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_603fe2c25203e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60189012f1e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fdaad26e9efa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/bunuwew.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/karika.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/57243040970.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/final_blends_worksheets_for_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/is_costco_ham_cooked.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/gaxejebegadabufapufibakup.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 5328 bytes
SHA-256: c652d8100bb5c23acd569a4bc5391c7ad9adf4af34253d9eb8f7189559490d35
font_01_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10576 bytes
SHA-256: 26a9668052b7a1a2ea82765a4b306714dc321d081b52b16ea2092226c3c8c26d

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