Malicious PDF — malware analysis report

Static analysis result for SHA-256 878d6be81a89ff40…

MALICIOUS

PDF

78.4 KB Created: 2021-05-30 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b89df7eb760516d7a836e57b58f4ec0 SHA-1: 1c6818cfa8304365123e72bee1a11926750e091e SHA-256: 878d6be81a89ff406abaeac6a0856c294c5290a86dd8ccc1a6ad6b2367fc2786
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-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://crophysi.ru/123?utm_term=cervical+cancer+prevention+guidelines PDF link annotation
    • https://silolezozuwagu.weebly.com/uploads/1/3/0/7/130774999/4397417.pdfIn PDF document text
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/d4c12.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/kosizokidegas-zofuzesuduxa-figip.pdfIn PDF document text
    • https://sakaromef.weebly.com/uploads/1/3/4/5/134507496/fefd8aff04a3.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/63d360d.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/215da.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/momonesuzuxoja.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/wugusejafapisu.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/8909124.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/natife_wufaluzet_dabomunavanozi.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/86ec8.pdfIn PDF document text
    • https://gibotekiwifij.weebly.com/uploads/1/3/4/4/134444926/wevafofemenar.pdfIn PDF document text
    • https://lixabexuraluna.weebly.com/uploads/1/3/4/2/134234562/c5b81443ac8c8.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/fdb0670.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/gevezimunaraxezefam.pdfIn PDF document text
    • https://gopojobazisedi.weebly.com/uploads/1/3/1/4/131436977/4517502.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/gebasagolatatovo.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/85d622ff-ebc0-495a-a236-fa8fcafbfcb8/83312766647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1991918-3d10-45bb-acb9-dd67d084a45c/90441334167.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5208 bytes
SHA-256: 81d841e51d2dfce1b81f865b544321a0ea44ae483ef0108c23180d421b611a9d
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 11464 bytes
SHA-256: 354ce8e2447d987c8a8ab5f53197e6664058d7c65866ae1c95e701b35c15fe33

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