Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb174882f3beab8…

MALICIOUS

PDF

67.3 KB Created: 2020-11-23 20:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1af91a237bb15f06b835954b7ceb3803 SHA-1: d72d8fb2217230edfa16cb9a3001991ffd576bfa SHA-256: abb174882f3beab8290e2e5189141170c455bf2c10d4af0965e6ac17f4ef0d74
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://traffset.ru/strik?utm_term=workday+hcm+training+manual PDF link annotation
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/16adb065a5c8a.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/7e05ab.pdfIn PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/7bd6a244c5d910.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/6521197.pdfIn PDF document text
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/lixitobubatodovuno.pdfIn PDF document text
    • https://nokajaxupi.weebly.com/uploads/1/3/4/7/134715681/goxenuvozog_vidas_getaliwejula.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/dofunenamoz-fusikaroguta-zuvamipal-fuwijeralefet.pdfIn PDF document text
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/2745268.pdfIn PDF document text
    • https://momaramurelu.weebly.com/uploads/1/3/4/3/134309976/743f8c2d6c995.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/rirotesike.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/5543708.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/4d5c5b8e-0a0e-4e32-b44d-fe19ec4cdd9e/94756272039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4d548a-563c-4dc8-9154-1cd85ee1273c/workmate_425_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/family_farm_seaside_mission_guide.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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 5356 bytes
SHA-256: 22ff444dd5e6ea62e2ab1a22f5807b3485237487b624228fd517889c7947231a
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 10332 bytes
SHA-256: 0ea49ef3def83bf17295086df4407128ed535648dd080135a0863b1c22cebe8f

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