Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0fd44ea58b9ba5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 00:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5861a1e3bda7c5f5976940934ab67933 SHA-1: 68d740ae9f1cbd601f1da049066c54351c29846a SHA-256: 2f0fd44ea58b9ba545d3a90a93a7f834c41d27dcd2f315be75dd5aadacf5f16f
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. Heuristics indicate it functions as a link farm with a high number of distinct hosts, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tecnicadovolante.com/images/file/45592771558.pdf In PDF document text
    • http://parvazyab.net/basefile/api203/files/doxebema.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/41718231546.pdfIn PDF document text
    • http://malifer.hu/upload/file/21964254801.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/pakiterujeximag.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/62244143201.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/pijodibovuka.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/jatazuvesidefamegob.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/21710007693.pdfIn PDF document text
    • http://ruresept.ru/files/file/44978234347.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/lirulige.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/majigewobubixusiwupisul.pdfIn PDF document text
    • http://synergyproperty.com/images/files/jadufeliketixovobewari.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/pelaxowemimanalekozi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51461874796.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/86670706821.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fuvodumepagimurapozat.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kiperawaxipatigalakudago.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/bowesenexixixowek.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • https://combrooncom.com/contents/files/vozunuzubixulil.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/23544160023.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/2213399297.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/6035004411.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/64659398821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ultimate+chicken+horse+apkPDF link annotation
    • 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10736 bytes
SHA-256: cbf7505fab5a4628ee85eb86a74e2a89c038d28bb212aa57cb3f512f6a2902f7
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 19588 bytes
SHA-256: e217ff5496e7c03d64eef9840388a06a85289c2ffcfc9333ccc4eb11002ce7c2
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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