Malicious PDF — malware analysis report

Static analysis result for SHA-256 7333dfefe3761d8f…

MALICIOUS

PDF

88.4 KB Created: 2021-03-19 14:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aaac96dde66edf7be01c7a692c0fcd37 SHA-1: 9ae806518ad886f3822e101079647354194f3b44 SHA-256: 7333dfefe3761d8fcd401795ee21e1b2b73c947f4d680b9870608e13889d880f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://mezovuduw.ru/wix?keyword=arrow+lexington+10x14+shed+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378153/normal_60067592e6a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_602bf75785c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_602290e7a7ca8.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/NijIUeV/96349375001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5ffbc5ee3da15.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/jfNpXgf/pipite.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/2ceb9e80f8f.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/mSGPGFK/all_information_about_football.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/543248032.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/1608332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_603723029d0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fda3b78514a9.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/Mgh6HGm/gewonivev.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/c0a9713f-f2bd-4e90-8357-d941bae2523c/how_to_program_magnavox_universal_remote_model_mc345.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_6a694caa92714dc690e5e22af428438a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c4205c-3212-409e-b757-8d2eb7a4b742/46491253799.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_dd7872f2a035493aadf8b76f9a4f25e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f70dde-752e-449c-8a3e-cf1ce58703d6/75771054841.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_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 5668 bytes
SHA-256: 8aee09f5c0d56193b9239f8d51695e5a34cd8e22e7252c0ba05db740ab69353e
font_01_sfnt_off00012d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D82 11464 bytes
SHA-256: 54b98a733c43d4de9700c5ff00e3ccee94efc3563a836c776f1b7df1ee460b16

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