Malicious PDF — malware analysis report

Static analysis result for SHA-256 6543ce4385512e65…

MALICIOUS

PDF

82.7 KB Created: 2021-05-20 17:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8e4e5ded8aa07cbeb973a41eb70d670 SHA-1: b88e658324638ae08ebd129f3a973efe8f75793e SHA-256: 6543ce4385512e6539eb3f38bd55f89f4f8261c1d31c9841d0d17c20552ff03e
196 Risk Score

Malware Insights

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

The PDF contains a link farm and a URL that appears to be a search result for downloading 'Slender Man', suggesting a lure for potentially malicious downloads. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing and malware delivery. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt.

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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=slender+man+download+free+full+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476590/normal_6061059d90423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5ff1b660b5db4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5ff7c91958b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601f0c894715c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_6060cb60b4151.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/monowuzofofigerape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_601aabad0e632.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/jeruzaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5fe391ec0f3ec.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/1433678.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/0d5d073cf5b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_603936af17791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/37108565048.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/pinuforigunitiwad.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/how_to_solve_mean_median_mode_and_range_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/jutilojujeveriwovejizap.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/93955719497.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/23380601267.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/zagoruvobabi.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_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 5308 bytes
SHA-256: 6ef594cdaba73af73b1ca97b5e1de687baa7d9a9ff6e601e73e5049da7789f1b
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 11776 bytes
SHA-256: 776c716779383038d8b9efb39ac4cc6bf74e3eae1b22ceb82cc6b9936a0f28bc

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