Malicious PDF — malware analysis report

Static analysis result for SHA-256 258b285a52ffea0a…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 09:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8da738637ff34448e9d9a60ce6c0f8cd SHA-1: 5f2a4434d81516cc1327a3d35827fa4a3ced989e SHA-256: 258b285a52ffea0a3c54ccdb47e832bfe83b9cfbd3e1c6cbf203007ae804bb93
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 0.9998

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://leonvi.ru/123?utm_term=what+are+the+wild+dogs+in+australia+called PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fffeaa7dac50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601673099085b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6039163fd7776.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/8b61d79e62b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_60242cb2439bd.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/2276159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60224cf0cdcd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_601f63a5cdc9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_6022d7ff1c8cb.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/pemogofigafogiripak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5feba054759ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fee9c2fb3e21.pdfIn PDF document text
    • https://kolagigeb.weebly.com/uploads/1/3/2/7/132741023/8280bfd5b9d41a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_60256be86a7c6.pdfIn PDF document text
    • https://zaridonuxubotu.weebly.com/uploads/1/3/0/7/130775126/ee7ec8fa04d427.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/5e5d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemavasaw.rf.gd/schlage_keypad_door_lock_factory_reset.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5304 bytes
SHA-256: db254dcfbf9d309eb2c71b2b63bea977f6ba3218415f62701d8389dd00d3ffe7
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 11256 bytes
SHA-256: b81bd7719e6404aaa34e6e117f4f7021d4a435d339ed2c4ad9ea0239c9ff83b7

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