Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c26e3cc6101172…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 13:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e025b9b5e83bb1680f6c5b0675661d38 SHA-1: e02b8f892e50f7e4c7b58ec4f8b90d5b17375a5c SHA-256: 29c26e3cc6101172fd09607331195712dd713ca77ddc63194b0253eb1daedbac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=4+your+eyez+only+zip+download PDF link annotation
    • http://pass38.com/images/contentimages/files/9582340751.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84798536943.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/46304950671.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/14440015920.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/lifot.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/13092615460.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/fudararozasewarofirowino.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/42869962733.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/48729947858.pdfIn PDF document text
    • http://netart.hu/userfiles/file/lapofuve.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/80071314143.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2hpv8t2d4htmtnvr59h6bc9paj/25485257836.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849865994e---jugejawenawupafiwapum.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/fasin.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/79859318336.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8947569656.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/duzorejakaligozuxajopuzag.pdfIn PDF document text
    • https://soechi.id/userfiles/file/9210269531.pdfIn PDF document text
    • http://cl-pub.com/files/files/79506839673.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/23983877174.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sipemogogo.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/vesoroninituwawet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 10460 bytes
SHA-256: 30fe9fba52360a7d9e2e97056bb39de5688669fe79e98c7fcf6653f1b11a2f3d
font_02_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 20168 bytes
SHA-256: 03dfebcb75090d4609a58eefe93c2fdc23ad98bfb57c667a251c7e3ae3d91515

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