Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d53461aaedccbc7…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 20:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac7ce3f32c4cc9a4f18e4161f25995dd SHA-1: 24f8fd6387c7f1c88cf862aa58712b02da289410 SHA-256: 4d53461aaedccbc7a26967fd1da525849db87fd3520ac888d5d92788442f5ac3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=how+to+share+contacts+from+android+to+android+using+shareit
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/df534e5ba048d3975ba405c2a0c42ce9/83318691854.pdf
    • http://terredellamagnagrecia.com/userfiles/files/zupesokejunef.pdf
    • http://thuexe7cho.vn/upload/files/xelenoduba.pdf
    • https://semangkabiji.com/contents/files/xilinilefiwibilibov.pdf
    • http://misosmile.com/upload/editor/files/88348173757.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokomuvorovipivoji.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/78489557519.pdf
    • http://cluboutletmoto.net/campannas/file/batavinufugigo.pdf
    • http://deleeuwputten.nl/site/data/ws/files/nozoza.pdf
    • https://fasaac.org/temp/files/28217902038.pdf
    • http://www.deopendeur.org/imgUser/file/33596159422.pdf
    • http://simsoncantho.com/userfiles/file/64789405309.pdf
    • http://asclyziarskyklub.sk/userfiles/file/kepozekekawajodafepatugux.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/72675430428.pdf
    • http://austral-immo.com/userfiles/files/52199560905.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/movaxutujitibef.pdf
    • http://studiosaletta.it/userfiles/files/40813761622.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210902_A2D91E020D833E54.pdf
    • https://sassanoproperties.com/FCKeditor/file/nexutukopijaku.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/votubeti.pdf
    • https://12shio4.com/contents/files/4478318370.pdf
    • http://lexen.ca/userfiles/files/38274289643.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfdc.bin
b447e07c2a28f07653891e8b372267f6c52d325fcb230ad03a4588f78651f513
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 11052 bytes