Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e0bdfe4a83c93c…

MALICIOUS

PDF

75.6 KB Created: 2021-05-27 00:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4199c149745dcc0cf917a17b29b9817e SHA-1: 50ad13131503d1d0c8f04b2a4b88519cbca7c53f SHA-256: 71e0bdfe4a83c93cbb0129c9cd995e75b48c7038c8d8f65fc4b49db550307bd9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=why+digital+asset+management PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386334/normal_603badff80240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_6007444b07ba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fcf80ab530c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_60404ad663e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_6059c8fcb1447.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/lozev_memazuteneme_mirotedofazit.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/tetux-disuka.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/bamudunukifekep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_602530b5b8c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_602e27f5544bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fdf9bcfe4cae.pdfIn PDF document text
    • https://lugivizukur.weebly.com/uploads/1/3/1/8/131871894/pudoxokuzifuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5ff042a943eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_605797009a28d.pdfIn PDF document text
    • https://bizegesozuno.weebly.com/uploads/1/3/3/9/133997168/f5eb166ef4f57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af61e40d-358a-4852-a032-058e25daf191/89968340216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98693651-be68-4a17-af6d-f321afd0a763/what_is_the_best_online_interior_design_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1a2581-59c8-479f-aaa2-b2d3a53ed56c/fanuc_programming_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc570481-64bf-444d-a284-fbedea579a92/70749268169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93e838b-c371-47fd-b476-c9bee60b2cd4/best_online_portfolio_for_interior_designers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12eb55c-c436-49d6-a012-ca4222377f0a/crs_report_due_date.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 5260 bytes
SHA-256: 6c9d5034e47ddb534f8fc1a6c709a582893520afa7288266c075f314487f9ac7
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10772 bytes
SHA-256: 6ff6b804f95958d5ca63d50d34da0d02bfcfdabaecd2b17d3a7d56feccfd12c1