Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c7aa72dd126422…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 12:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b2be731f28d302302d364b82b61f9d9 SHA-1: 2b36d72ed67cd79b4dcb442da73c7b18900048c2 SHA-256: 81c7aa72dd1264228713822d89587b2064a61ada1e813a01bcc240faeb3c82ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=farming+simulator+20+download+android
    • http://galantemontagnana.it/ckfinder/userfiles/files/fulasekefodig.pdf
    • https://cityface.cz/res/file/78639271117.pdf
    • https://iqrainternationalschool.org/_assets/files/5000233877.pdf
    • http://bilafafafa.com/shopadmin/upload/files/11348658877.pdf
    • http://khachsansapa.vn/webroot/img/files/61893392203.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bofaviwakuda.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7bb796c06---setapodanepababagof.pdf
    • http://musikpark-live.de/userfiles/file/18243185402.pdf
    • http://majedalkarkhi.com/pics/file/37670746831.pdf
    • http://ferrocom-spb.ru/userfiles/files/65216089857.pdf
    • https://vibangnhadat.com/uploads/files/femuzimegokonugu.pdf
    • http://galettedesrois.hu/userfiles/file/tetok.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93a9df613913752436e3d71862a2c045/22537754818.pdf
    • http://stellarp.com/userfiles/file/52491700039.pdf
    • https://floridahouselottery.com/test/userfiles/file/51797085250.pdf
    • https://kolbandibileklik.com/resimler/files/porimufofupukis.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/2942288905.pdf
    • http://xaydungphongphu.com/uploads/files/jizexedazu.pdf
    • http://demirlermetal.com/resimler/files/gupimoxipesewezida.pdf
    • https://riwg.in/userfiles/file/tatoxonemarerasubusari.pdf
    • http://petukmahaaaraj.com/userfiles/file/88566249332.pdf
    • http://gernano.eu/gfx/userfiles/files/pumezesowogonelo.pdf
    • http://brandorbit.in/userfiles/file/36213945311.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac3.bin
d26bd03e1e79930ed35b9a2e618f0535b8d6ddf59ed3af8de943188ab8e36e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 16372 bytes
font_01_sfnt_off0000f4a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16792 bytes
font_02_sfnt_off00010cb7.bin
be8ff662f66cb6eeb54027b76d7bc19d2cadde0fc5e5354c956f6b7c2e8ebaa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 10864 bytes

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