Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b0ef30315b931f…

MALICIOUS

PDF

84.6 KB Created: 2021-04-04 23:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d6f996bebcb80938a2fcf5776baff7 SHA-1: d7813197a4e2ae1e2ceeff2bfcf4fe072de5bbaf SHA-256: 21b0ef30315b931ff14710db071bd51dedcab6156a02c0b015f31c486e24dbe2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically a 'PDF link farm', suggests a phishing or SEO poisoning tactic to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8221

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=the+interpreter+of+maladies+by+jhumpa+lahiri+pdf
    • http://top-agent.ru/wilinurzevnx.pdf
    • https://cdn.sqhk.co/wemitupu/MrjfOYp/clash_royale_cards_ranked.pdf
    • https://pexififowuru.weebly.com/uploads/1/3/4/7/134714045/tusibetanaluneb.pdf
    • http://fruit-italy.space/shark_lift_away_xl_navigator_reviewsio93c.pdf
    • http://normab-id.com/25192436358fdmsm.pdf
    • http://erogan24.website/12121637533j4tbl.pdf
    • http://voicebftyi.com/blend_it_3d_hack_mod_apk3org0.pdf
    • https://cdn.sqhk.co/xubewarow/e58hh8n/aerox_oxygen_fittings.pdf
    • https://jafakafewubili.weebly.com/uploads/1/3/4/3/134397715/9909357.pdf
    • http://zivuvosiz.epizy.com/33633178473.pdf
    • https://s3.amazonaws.com/muvemasoxaji/dell_t330_server_data_sheet.pdf
    • http://jidifulake.epizy.com/application_letter_free.pdf
    • http://gegepemu.rf.gd/honda_hrx217_repair_manual.pdf
    • https://s3.amazonaws.com/rebomedug/how_do_you_change_the_batteries_in_a_stealth_cam.pdf
    • https://s3.amazonaws.com/sugowubuf/lofariditadugugot.pdf
    • http://pubamawuxa.epizy.com/little_caesars_pizza.pdf
    • https://s3.amazonaws.com/gogoxowiniza/76644024524.pdf
    • https://s3.amazonaws.com/naxozelozude/97366709814.pdf
    • http://luvibiw.epizy.com/tawilisarasuxuru.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012861.bin
823092325892339ad847c38052ee43dda872a6840acbb5da04bb46246be4bbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 8672 bytes

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