Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d90d9cb1f57bd3…

MALICIOUS

PDF

72.5 KB Created: 2021-02-26 23:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5a342fc626468960050cc5a6434e9a81 SHA-1: 0a7eea10fbfd02818f193ed5b599f513e5e64780 SHA-256: 50d90d9cb1f57bd368ab2f338798a6d4ff6d2fc300a943433d8e1ed023162b2d
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely hosts malicious content. It contains a large number of links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=sony+xplod+car+speaker+price In PDF document text
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/5282512.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/lelew.pdfIn PDF document text
    • http://swiss-family.space/sufixuzukunepavinusijafejnd4v.pdfIn PDF document text
    • http://repair-telefonov.ru/kerunevemufueqmzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_60297229c8f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_60161a58d5061.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/hhSiihj/island_21a_pointe_au_baril.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/68he7jb/zusube.pdfIn PDF document text
    • http://pitushok.space/cfa_level_3_alternative_investments6eejj.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/rusup_rodagomufixej.pdfIn PDF document text
    • http://naturebiolog.fun/wulojurasaxajobikoperofvo9sq.pdfIn PDF document text
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/kizikorejux_retinozixajibo.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/meguvaxupenalas_jebok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fc963087398f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 5404 bytes
SHA-256: f0ed6f467fa026e343b4b538f6f1e8e1944e86ff1bf1d8917af85fd7009f62a2
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 10672 bytes
SHA-256: 12c5dbf2e930902c99db1f4041db2ab05456af52da5e91aed755da7fbfe789d1

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