Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a1de334bf41e22…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 13:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d1a7c9163e827ade40d23dd056b7746 SHA-1: 1addb62e5a5910edd12810b42df9b2c1ac12346b SHA-256: b8a1de334bf41e22efe018ea11e47719372c867bbe1abf24999be14be5f52fab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=like+gta+5+game+download+for+android PDF link annotation
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/73312094239.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/76284650892.pdfIn PDF document text
    • http://alltechsro.cz/files/11354805096.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/6004195349.pdfIn PDF document text
    • http://soc-in.com/data/media/files/96927613769.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pevakujeniwiwixitunodobi.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/61757009978.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/75534043148.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16716164375.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/xuribub.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503442957fc---27344894980.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f80ec4ab---wanowa.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/95904975892.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xufivuvubinek.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/tijomokejelazex.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/segujilozozaxemujepu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/rafepif.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/luvarilu.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/80886168472.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/78505455504.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/46680501913.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_off0000ad7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 10800 bytes
SHA-256: a7c2d2bd9600310fa1c586a174275c702d76a817d7d1e9481a04513d6bd1f8b3
font_02_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 16304 bytes
SHA-256: df2dd5fa4e58e355c48bf3023d18780f14f03ae875121fa99d5c4c152d8a6326

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