Malicious PDF — malware analysis report

Static analysis result for SHA-256 f431af91bc413dd5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 11:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01cb2f2e3edab26cc36969e0e7822d7b SHA-1: c9be9d4a3f2682710e9668950eba05685ca05280 SHA-256: f431af91bc413dd51d62b57fd12fe8b5e5ac715d65df90737434525a2128d9b5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV heuristic indicates this PDF is a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains, and one heuristic specifically flags it as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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 http://seksdagen.nl/userfiles/file/50932319169.pdf
    • https://maconlux.lu/userfiles/files/xenijodonizo.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/65461614271.pdf
    • https://harmony.im/userfiles/file/74982274932.pdf
    • http://av72-reklama.ru/userfiles/file/16308656744f1fd7e7b0c29be2cf7a.pdf
    • http://kuryakyn.ru/userfiles/file/15705147094.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/witegikilaxarajozamugono.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522341edc4---gotoz.pdf
    • http://ptaki.info/imgekoprojekty/files/riturajilanukumubijekaj.pdf
    • http://flywings.sk/UserFiles/file/25876829078.pdf
    • http://bearings-home.com/userfiles/file/morupitorelonigo.pdf
    • https://liantoong.com/archive/upload/files/sekon.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cd504c33b8f4caa90a8426879ee88df5/36201719912.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/62916689071.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/21642623755.pdf
    • http://agecarekorea.com/ckupload/files/22477105230.pdf
    • http://lexen.ca/userfiles/files/sijexijidisuforawijanatuf.pdf
    • https://wineart.online/userfiles/file/semotofifadukesukogatine.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/rinigodifemazewek.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/pobunow.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/9199017152.pdf
    • http://studioindelicato.com/userfiles/files/79366945192.pdf
    • https://elperrocallejero.info/ckfinder/files/wugowufujovog.pdf
    • http://twilaw.com/files/files/15396887217.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=it+follows+2014+full+movie
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb06.bin
26c195670d4d0152658e57cbc14bcf62ee6a53b302cd48837c2c2a0340eccab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 19080 bytes
font_01_sfnt_off00011cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16792 bytes

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