Malicious PDF — malware analysis report

Static analysis result for SHA-256 5717ed4aa49a8cc3…

MALICIOUS

PDF

81.6 KB Created: 2021-05-30 01:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04e4ecf90d6723abe56cf724a63ed38e SHA-1: 007ff745dd3232736b1316e410930260e0fa6030 SHA-256: 5717ed4aa49a8cc3ca36ed29f27eb94a6681a7570b71d2b585d19649a3452b24
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. The document's structure and embedded links are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ponafet.ru/123?utm_term=electric+forklift+checklist+sheet
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/2728163.pdf
    • https://tewiwumorivare.weebly.com/uploads/1/3/1/4/131409909/nugizegib.pdf
    • https://jeziwirumefije.weebly.com/uploads/1/3/4/6/134670599/jerida_gazojos_pesupubovawoje_maxidosule.pdf
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/xiporowatuwuwejomuta.pdf
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/ratazugajapokuwur.pdf
    • https://cdn-cms.f-static.net/uploads/4386074/normal_602b7af3520a2.pdf
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/jenasiwobuga-birebokuroj.pdf
    • https://kobuxomibusopi.weebly.com/uploads/1/3/4/6/134609859/2820696.pdf
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/627e7.pdf
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/dimesonapuba-bubipu-lekuza.pdf
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/banonebopavemu.pdf
    • https://gosizunasinati.weebly.com/uploads/1/3/0/7/130739879/maxebekusaba-ziluvew.pdf
    • https://zalefukonu.weebly.com/uploads/1/3/4/3/134346034/3db20383c2.pdf
    • https://xununurolaweb.weebly.com/uploads/1/3/4/6/134673503/lojerinaledovijaso.pdf
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/lupuzoman.pdf
    • https://cdn-cms.f-static.net/uploads/4495400/normal_604cf7b87a1ae.pdf
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/zefopam.pdf
    • https://cdn-cms.f-static.net/uploads/4420617/normal_605f5e6f35a8d.pdf
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/12ee7a6.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/3096035.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000103cc.bin
92f2de8547180843314145380d42e382352a66a5e74bc7304591141c4beb28b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 4780 bytes
font_01_sfnt_off00011413.bin
3e28478e87b1d3bc6f83dc3a95decd056c00293d165f11d7bca7896fc53dceb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 10880 bytes

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