Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf122ce5f39826bd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 04:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcaf14d27544413c42510b96ee43fd2a SHA-1: 98cc92b0e22f8d22904eaf7d70b5589824d80dce SHA-256: bf122ce5f39826bd3d24f591a50a03d4d9d0a2ab794aa86356cfa45acee51b62
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of MFA/one-time-code lures and callback phishing lures strongly suggests a credential harvesting or social engineering attack. The document body is heavily obfuscated, but the heuristics point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://vipnjl.com/userfiles/files/61825380621.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/bixegufi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161329a6256425---6800642509.pdf
    • http://caerulumpharma.com/upload/files/36827051224.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/84679407517.pdf
    • http://itkaufmann.com/images/fckimages/file/bakilijusu.pdf
    • http://mobiliteit.nu/files/vawajozanofidugimuwiwun.pdf
    • http://1careglobal.com/upload/files/gugatofu.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/85844850684.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/76457954691.pdf
    • https://amzentransportationindustries.com/admin/imagetemp1/file/35269488602.pdf
    • http://hani-bee.com/userfiles/files/gusisopiva.pdf
    • http://modero.vn/upload/files/vapatos.pdf
    • http://wumag.pl/userfiles/file/98547278905.pdf
    • http://getsolarny.com/userfiles/file/93395772772.pdf
    • http://cadelupo.it/userfiles/files/wesusegofuvixejipifani.pdf
    • http://lnimeina.it/userfiles/files/76584388383.pdf
    • http://www.jindatunnel.com/up_files/file/69543117978.pdf
    • http://www.polni.si/Images/files/20034316968.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613125da7f1d7---16053332543.pdf
    • https://aradovan.com/userfiles/file/34138810245.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/durezugiwelimefeveperok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=link+para+hacker
    • 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_off0000d4fa.bin
2fdf40f5d9f615837791ec6b084fae94a97500c7ec4540e90a9859178d6ca411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 18864 bytes
font_01_sfnt_off0001062b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
font_02_sfnt_off00011e42.bin
b3e903e28dbe50eca1c3c0642bae5bd5844eb1778a02ed12e0fa45da70b79b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10088 bytes

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