Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd8f194d73b3535…

MALICIOUS

PDF

98.6 KB Created: 2021-05-23 16:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59e52d498cffca54f03124d81106c8a SHA-1: 0e375aa7d1ff6686d6e8ec829b6f0479496977b3 SHA-256: 1fd8f194d73b35358680c33993f1d538abdcfc91be12b9fc27e8876c955b3112
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://vilenefex.ru/strik?utm_term=secret+ya+latif+pour+l%2527argent', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text that may be intended as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=secret+ya+latif+pour+l%2527argent
    • https://cdn-cms.f-static.net/uploads/4447265/normal_606dc76ccc9c2.pdf
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5ff949bea0e2c.pdf
    • https://cdn-cms.f-static.net/uploads/4489588/normal_6062bdcdb8135.pdf
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fed2e17ba361.pdf
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fd82cdb239e8.pdf
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fd22edd79ca3.pdf
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6046638547b98.pdf
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5ffe0fd486004.pdf
    • https://cdn-cms.f-static.net/uploads/4448720/normal_601bf956f3565.pdf
    • https://cdn-cms.f-static.net/uploads/4378406/normal_60252a23de605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tarajix/40042588220.pdf
    • https://s3.amazonaws.com/legipalofi/88020634358.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/jakago.pdf
    • https://s3.amazonaws.com/sitok/welixezuxasaloza.pdf
    • https://s3.amazonaws.com/kijelopazekune/51561105262.pdf
    • https://s3.amazonaws.com/sefepugolupalax/why_does_my_microwave_make_a_loud_noise.pdf
    • https://s3.amazonaws.com/pogolo/64194340475.pdf
    • https://s3.amazonaws.com/sefepugolupalax/annamalaiyar_songs_free.pdf
    • https://s3.amazonaws.com/xutomoxu/lemon_face_mask_sheet.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
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000151ec.bin
725b7f9d5663aea7b3e5cb7a8d4cbf011ce305b79b14dd679e6f3fa86bf3eedd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x151EC 23236 bytes
font_00_sfnt_off000113b5.bin
db0b2a1b005a356fb2e052fc1d03f358fa4ef4d18f0f62c560dac4e222b3241a
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 5244 bytes
font_01_sfnt_off000125b5.bin
6d49b7e331a09e6e39b901c7ca1f534248aa4abf1ff074d3541d0effe050f10e
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 14336 bytes