Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2017f21df72d22…

MALICIOUS

PDF

76.7 KB Created: 2021-06-01 18:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f202b2e31cea8d097df4717ce057a285 SHA-1: 17188b14e138f24f823f46325b75484d5e121bb6 SHA-256: 6f2017f21df72d220b2822b1cacc8c782f5bca843fef8fd27b12dd1c6c2692d0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=internet+explorer+windows+7+stopped+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60344c2d5691a.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/2f44dd93593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_605402acc8dc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5fc751479a31c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5ff221f427ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_604b8d8f7b04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601aed2e90ad5.pdfIn PDF document text
    • https://vogowabiruzo.weebly.com/uploads/1/3/2/6/132681596/83d3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6027ed2fa2863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_605c0094a7c5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5feed48b7a3cb.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/e102e3ba53.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444875/normal_60b61f0a0a242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_604020a7197e4.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/065ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601da3730ad69.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/ximeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_604cfdf187d1b.pdfIn PDF document text
    • https://poxemole.weebly.com/uploads/1/3/7/5/137502683/fejokoze-biratiripopudo-roxipeju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 5160 bytes
SHA-256: d13be9be3ed5baebb3a9dce3d891fcf068e0eebad4584cf48a481179b685a3b3
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10916 bytes
SHA-256: 492589301730abedec5b259b4c6c564cb9dc589b5a5661f247cbbf21a8b58453