Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05b514bd6e03bf7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 17:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 069c62cf2e12c7931b247ab6804ac57a SHA-1: f44817233ff053ff079ce68c87cd2a061bf73470 SHA-256: e05b514bd6e03bf7802af8c7eee490049d7e902523f4f44a425e25d26004e0a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing lure, specifically using a 'password-protected archive' pretext to trick users into downloading a secondary file. The embedded URLs and the document's structure, identified as a link farm on disposable hosting, further support a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a trojan designed for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://inwebjor.ru/uplcv?utm_term=remove+password+from+pdf+online+free
    • https://kaptenhoki.net/contents/files/17903180829.pdf
    • http://webspace.mysdam.net/images/newsletter/files/19816109303.pdf
    • http://laros.cz/UserFiles/file/napidoralasorikexirilamo.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161346077d1b7d---gijoxikarasijijitidepozir.pdf
    • http://gfb.it/upload/fck/file/vizezujusozasubotopise.pdf
    • http://georgekoldun.com/var/upload/file/47474811488.pdf
    • http://tydafa.com/dafa/uploadfiles/20210912104943.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cbf4a8e1---mopudeguvureteta.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36372991456.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/11458074351.pdf
    • https://panificioilcavaliere.it/userfiles/files/warononaxen.pdf
    • http://ssatripoli.org/userfiles/file/sefoxevosaj.pdf
    • https://mongolia-volkslift.com/uploads/files/26399025586.pdf
    • http://jingyitech.com/uploadfile/85776901770.pdf
    • http://meyanko.com/userfiles/file///2499132954.pdf
    • http://hueide.com/upload/files/58456749269.pdf
    • http://sportingfoundation.com/uploads/file/2061229476.pdf
    • http://gemmacapitalgroup.com/foto/file/xijezajaso.pdf
    • http://dallard.fr/ressource/site-image/files/55701162858.pdf
    • https://hiperaktivite.info/userfiles/files/jetiras.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/35060839837.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/judekavapiwelazekevaxusef.pdf
    • http://4998horo.gmmwireless.com/contents/files/28949096739.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_off0000bf88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 16792 bytes
font_01_sfnt_off0000d79f.bin
e4bff5cecc4e2addbd191e356e983a7a6e8209bdc1faf6ea3348d17fefd3079e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10756 bytes
font_02_sfnt_off0000f057.bin
eae06042537332143321201cb805ee0623b38f14da49cadd3e1b7a0e9217de38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 17672 bytes

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