Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a150bfdd1fbf12…

MALICIOUS

PDF

80.6 KB Created: 2021-03-20 02:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de3cad0e74f3d163021a9caf5405f8b1 SHA-1: a6036b2035e5bb232054b060712ff3e5340496a3 SHA-256: 82a150bfdd1fbf12e508328233a70eb6521dceb21e0a3725ca7badc309b99d69
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'seumenha.ru', which is likely part of the phishing lure. The document body, though heavily obfuscated, suggests a 'textbook' theme, aligning with the embedded URL's keyword. No scripts were extracted, but the presence of external URLs and the nature of the detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://seumenha.ru/award?keyword=new+additional+mathematics+textbook+pdf
    • http://gelumagiz.iblogger.org/adobe_acrobat_pro_x1.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_6042f76091fda.pdf
    • http://zuzorovix.scienceontheweb.net/97391330875.pdf
    • http://gekodejevotug.medianewsonline.com/27009091979.pdf
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5fda6ca36b0a8.pdf
    • https://cdn-cms.f-static.net/uploads/4485301/normal_600a2650608aa.pdf
    • https://cdn-cms.f-static.net/uploads/4368752/normal_6047b718356bd.pdf
    • http://gefapunugavop.iblogger.org/14269000572.pdf
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff6c6f9df02d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozipoxux.rf.gd/archicad_21_to_lumion_bridge.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f25b820a378c408cb1afdbff2095df1b.pdf?index=true
    • http://tefetuzuzip.myartsonline.com/portrait_drawing_for_beginners.pdf
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_113171208fe24ec1a2d310c55871f760.pdf?index=true
    • http://zasuwunal.myartsonline.com/42331210189.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_628c0c3b3c4148edaa10ff1d28e5e39c.pdf?index=true
    • http://pifamodaz.rf.gd/cftc_weekly_commitment_of_traders_report.pdf
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_0adee1896829487db765c12d88973178.pdf?index=true
    • http://kinadawefenipe.rf.gd/19874815921.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_6c16cd8b041f4950a657f98a6543061e.pdf?index=true
    • http://norilonabu.epizy.com/sopowizewijipitidogeso.pdf
    • http://tofepabozamawur.epizy.com/vonelojuwasu.pdf
    • http://vuzuwukef.atwebpages.com/37543877427.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb9.bin
0387309ed54650083a39eb59ad931bc29709f123cad506e37714e9ec50ce4d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5632 bytes
font_01_sfnt_off00010fd9.bin
30330a9b7ea2b5f9a53dad0eebadad7aaeb6bd4f5c5dbc6fa6f895228b04c206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 11060 bytes

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