Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c90d8a52b3ed1d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 18:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ebc3a2455e7b40eda9c7906c5ae7c4b4 SHA-1: 9f67c3319a421c2e036200377e17d93ecd08dc0e SHA-256: b6c90d8a52b3ed1d17860289fa2f603794354d4660930c5357ba9b7a027f8b77
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, identified as a link farm on disposable hosting. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://crophysi.ru/award?keyword=pf+withdrawal+application+form+pdf In PDF document text
    • http://xbet1.fun/37427459505cqdr0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_602e772ddf88d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fe36e327667e.pdfIn PDF document text
    • http://mbfsopg.com/intermediate_accounting_ifrs_solution_manualhkj1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff607c0c974e.pdfIn PDF document text
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/jaxosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60142ce337384.pdfIn PDF document text
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/nubinademufe.pdfIn PDF document text
    • http://50offshop.pro/british_spelling_neighbourlinesselcou.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/bfebf4a0a4.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/kanejadikizixo-vafunese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fdc54dc8802b.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/mapagelojoxesef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_60299cac55a7e.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/whirlpool_duet_steam_washer_error_code_f21tpvsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_6033d56b85822.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/child_development_worksheetsb0xdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_600e8ad973ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_6024c57ee6442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_60439623bd907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_dd50689ef1094b4e8e4e9f6eff73af7e.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_a00949392a1c484cb7337d5bcb210160.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_2b3a5fee54c5498ebfa9de3d8e8f9bc7.pdf?index=trueIn 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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5312 bytes
SHA-256: fdf60fcf124ce50f8f386b082923131597bd548b129616c2e8337522b2f880a0
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10856 bytes
SHA-256: 74762cd75ae6191f14e286b33a8e3d993c2552bf648cd83c3e0a0d80f295aa9b