Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cc397cbf4f939f…

MALICIOUS

PDF

86.7 KB Created: 2021-05-13 05:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7fe47db677882f1d6cf8e24725a34a3 SHA-1: 52cecde34fb6ecaa1de0eee494e08065e2683438 SHA-256: 91cc397cbf4f939fa4439585fcbb77d7e10cd89e5b65b4c61c354f52d6a9b315
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=acer+laptop+best+buy+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385206/normal_603aecd541dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_6052cde41f9da.pdfIn PDF document text
    • http://lolebunefa.iblogger.org/75416467556.pdfIn PDF document text
    • http://tukakesafaj.iblogger.org/bypass_road_hd_movie.pdfIn PDF document text
    • http://yoga-fitness.space/xolupepipazigixibogirasi6u22v.pdfIn PDF document text
    • http://febanadedej.22web.org/runuratoxuwomorogirid.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/makiwu.pdfIn PDF document text
    • http://strapslap.online/399084473894lpnx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480891/normal_5fde733f5dc37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_603e8ceaa3adc.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/pmay_application_form_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuwudepebepusab.rf.gd/bank_audit_checklist.pdfIn PDF document text
    • http://ramufezumax.rf.gd/85608269516.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/17637755572.pdfIn PDF document text
    • http://fobanixi.epizy.com/37537117862.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/roninileramu.pdfIn PDF document text
    • http://jomozaredid.rf.gd/allen_asat_registration_form_2019.pdfIn PDF document text
    • http://nekogepi.epizy.com/jevowumexorob.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_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 5220 bytes
SHA-256: 5117b8075939dc6e8986e2de5ce24b8a951d6d7947e6eb05021cc2c0b490a245
font_01_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 11096 bytes
SHA-256: 605774a1560986fe044ecfcaa75bbf9a70b15736eff46848770add4ee256474f