Malicious PDF — malware analysis report

Static analysis result for SHA-256 3284c0232c22ec55…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 01:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43019f762c04a4f4f1fa5c09d981c88c SHA-1: b6a4430e0582ddbd42186296912061a4c4a190a4 SHA-256: 3284c0232c22ec550da6a8f80d303f096110b9562ab9ce92db64124340b26ba6
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://zajinet.ru/strik?utm_term=beyond+brawn+review', which is likely the malicious destination. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

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://zajinet.ru/strik?utm_term=beyond+brawn+review
    • http://antileqphh.site/29036852483eaqp9.pdf
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdf577b50aa3.pdf
    • http://wordwild-store.com/665475895953jqpp.pdf
    • https://cdn-cms.f-static.net/uploads/4476564/normal_601e3da8bb621.pdf
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5ff82e3444b67.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/6211787.pdf
    • http://ing-jobs-opportunities.com/munewikutemamatanul8ayc.pdf
    • http://rutekotugu.22web.org/kiran_name_cake_pic.pdf
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/sefikowenubi.pdf
    • http://mailedflkf.site/nikon_coolscan_4000_ed_vs_500086h9t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zodejewab.epizy.com/gmat_question_paper_with_answer.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/66641372693.pdf
    • https://s3.amazonaws.com/kaxukok/jobadub.pdf
    • https://s3.amazonaws.com/tumuzu/xafojurizumuvelaxavuga.pdf
    • http://rebefagor.epizy.com/34582847339.pdf
    • https://s3.amazonaws.com/zeworibuzoza/bcnf_in_dbms.pdf
    • http://kibowetesuve.rf.gd/tipuvidojidox.pdf
    • http://vepawipexujobok.epizy.com/rinugukamatejelibasu.pdf
    • http://sosefamip.epizy.com/steinberg_brickwall_limiter.pdf
    • http://segigeserife.epizy.com/coreldraw_x8_shortcut_keys_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
4261e120cfb4a82a75bb7f59b46782b75e7beac37547e3742b196b2384d00a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 4760 bytes
font_01_sfnt_off0001043f.bin
6850767af9ca91e56243ae3af3ab2f83d955de4a43173e13ec453b65eff6a033
pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 10236 bytes
font_02_sfnt_off00012758.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 4324 bytes