Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f1763aa48b105f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 00:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f68aa78a11cde81906966d307400096 SHA-1: ee933128c2f639e1ffe6beaf7cea918a717d7114 SHA-256: 81f1763aa48b105ff1e8c60ec33fb6c3a5aed97043d96f0227020c996dd3abb4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 4

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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

Open this report in the interactive analyzer, or submit your own file for analysis.