Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f243f1d560d2e0f…

MALICIOUS

PDF

74.8 KB Created: 2021-05-28 06:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f727062f1d89f5964099bd7117ba71c4 SHA-1: 5a84056bc45cef34687e3c82debb26756f7dd65c SHA-256: 5f243f1d560d2e0f394ed1452f519ae11ca29650dc5fc798c2a52052198d9e22
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it contains an embedded URI and uses an invoice lure. The document body, though heavily obfuscated, contains text related to obtaining a landline bill, suggesting a phishing pretext. The presence of multiple unknown URLs indicates a potential for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3359397ad4---dutonaradaxika.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7503cce7---wiwopimumi.pdf
    • https://ajitcoatings.com/uploads/47988821655.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa341d76f---21994294842.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ab10e02fe9122dbc9e4caf13e3f706a4/46580205719.pdf
    • https://kompaspt1.com/contents//files/zivokaduvon.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8249738f---zosozesex.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16212609743296.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vr06cijhqhn68ovvtv5dj2bid3/26448908557.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b7720c82---67307181447.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6716ef619109b0bc3737641229880045/rinuji.pdf
    • http://funperm.ru/content/file/34510155730.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609320ebc4f62---tabolazuzutologojidew.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/74b84e2085133cfc11dade3b68bdfbf9/11335115268.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4586113ca---2106229914.pdf
    • https://brahmagnanam.org/fck_uploads/file/31024597601.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ca6a3c74c822a914c7ad0626c2846b8b/xebuxat.pdf
    • http://www.findvoters.com/userfiles/file/85375010391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+airtel+landline+bill+online
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ea.bin
d3faf4b0b4c7289b76d898a1c28331ee4556fa91f5c37f680981a9a3a4c05c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5008 bytes
font_01_sfnt_off0000f910.bin
8b282698ccf266ce35bf867d143ae1a1d25e476e8f292876b46c16f1ee07801e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10808 bytes

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