Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4ea941825dd7d…

MALICIOUS

PDF

64.8 KB Created: 2020-11-17 08:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0ae62be2a14c1242af372ed43624a208 SHA-1: 2e3c200e91162215217b919e8df9fb20f092f393 SHA-256: 4ac4ea941825dd7db0d0adf4219acbb105f743fc75532dec91f786636df32ee7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious content. The presence of external URIs, such as the one pointing to 'trafftec.ru', suggests the document's primary function is to redirect users to potentially harmful sites.

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 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.
  • 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://trafftec.ru/strik?utm_term=from+the+depths+console+commands PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f97759a0f788.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/5296466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5f9f11d11751e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_5fa550f2ca797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f8bc285f2409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8cc0a26c8bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba85af27-8d1d-4689-8860-f4a061ab9955/20431526560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7439cd6c-d7d7-4249-8345-5013f733697c/xenikusuxuvogamebibofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc08a23e-0cc6-4eb9-8de9-23a36cb9f7dd/vegidumadevafatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdf6dd8-5d63-43ea-8dea-4597955e3964/snow_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cdb238-1d8b-42a8-8b40-d8050c75dc16/61004634943.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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 5268 bytes
SHA-256: 3aafdca6ec0412d7ea049ab5b4b6ab607670362075c6cf82e8fa9902991cad5a
font_01_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 10220 bytes
SHA-256: dd194c44087a128c14e4d2815691028d455f55e02d383c91610eb598c8d6abd6

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