Malicious PDF — malware analysis report

Static analysis result for SHA-256 9318773e4594db99…

MALICIOUS

PDF

86.2 KB Created: 2021-02-28 02:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d20228c5ecfd7e0b3cd4833c7885606c SHA-1: 42ad493182c18e12ea4fd0b5a9e3dac6ef97b7fc SHA-256: 9318773e4594db99ad7e507967da4fdf462b439344a348257df892e782833340
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic pointing to a large number of outbound links. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=what+is+a+void+contract+wikipedia PDF link annotation
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/410434.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/zebamumetibixig-rasija-dariwaparujizu-jenok.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/76bd35e02199.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/8977965.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/dff923f8ebbdec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379606/normal_5ff8097b8367a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390328/normal_5feff0226c120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fd6d859723ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd76f66f0b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5fef6a98c82e9.pdfIn PDF document text
    • https://cdn.sqhk.co/vozedolurezu/cIgeKib/automatic_reply_outlook_2010_missing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_601ba1e2c9806.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/hfieibN/vitacost_coupon_code_20.pdfIn PDF document text
    • http://lamenomapod.iblogger.org/limuzusudalut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penale/3d_scanner_pro_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/free_audacity_software_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/7845892157.pdfIn 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_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 5360 bytes
SHA-256: ad42e34a12af846af4ab21ed9907064567801056091257e040f51a62e8c5679b
font_01_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10432 bytes
SHA-256: e5533f27000646b4c663c2e36e8b26241a5f156c52e7ab3eafbb784bc3fbc020

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