Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c31a7b9329b4ef…

MALICIOUS

PDF

90.2 KB Created: 2021-06-10 21:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1517a2f04b3601f233998afe3da170a9 SHA-1: 71babbaef38d18d40bd0a346d1d6d307019addf9 SHA-256: 91c31a7b9329b4ef40733954289815bf843f0abe7b5674f14833564a3b404ce7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a movie-related search term. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cructi.ru/pbw?utm_term=child%2527s+play+1+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461523/normal_5fd86ae7b672e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff83203ed6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369935/normal_6003501639771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6026e82d5b5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_604a5d70d35c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_606e19a386774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5ffa4721bc084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_60162534b24ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_6063c7439d4f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_6002dd4dccbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_60468bb93f134.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/6556663.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/ramibelu_vovujakoga_nobovezuv_kinotutinamif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_605f986459e84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fcbcefddad76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feselikebapu.pbworks.com/w/file/fetch/144787137/pawexuga.pdfIn PDF document text
    • http://tefuraviwuw.pbworks.com/w/file/fetch/144774297/nobomevixavapogozidopen.pdfIn PDF document text
    • http://wenitat.pbworks.com/w/file/fetch/144773118/29541272340.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/clash_royale_free_gems_no_human_verification_or_survey_or_download.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 5336 bytes
SHA-256: b0c44bf53394917836234c2045adb4a38c034ea06513b511d4075a2357fa0550
font_01_sfnt_off00013406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13406 11648 bytes
SHA-256: b3f3e0b10f0ae799977f5fcdd0331a9b9dd0ff1d598b509a1fed5bc2efe5cbe9

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