Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b21f18468bb213f…

MALICIOUS

PDF

70.2 KB Created: 2020-12-06 09:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43129b7679f7e3b3406ab713bc2c44a7 SHA-1: 11d71081576073d21cf0821eeff98ad9ba7c9049 SHA-256: 8b21f18468bb213f0bbd3de1b7e7d7eb97bb6cc4a39a98d20aeae6c77d7a7377
254 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick users into executing commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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.
  • 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
  • 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://traffine.ru/strik?utm_term=rename+software+distribution+folder+server+2012+r2 In PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/a25b03652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5f94e08ec1458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9b00a7b8ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5fbf3af95919f.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/movuvoj.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/belemewujusevi-zevojo-tokuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5faa878f08770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499651/normal_5fc652f5a2ba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdef89b2c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f8f83321dda4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5fc6c01a9d0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_5fa88d6099b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d412239-e560-4079-b557-4598b7e2eca0/see-_through_combat_scopes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 5560 bytes
SHA-256: 1e74601425569009e63a67fc6b367662ac405b489eaf09bf87b793103d708313
font_01_sfnt_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 11028 bytes
SHA-256: 7d6e158c5a9e76c223cdda5c7e36cce304029e86b5a42e9c697ac2d6e8e3dc63
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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