Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f658844fa6cc0ce…

MALICIOUS

PDF

62.9 KB Created: 2020-11-14 15:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ea58c97838e8448a5e324750cd4fe555 SHA-1: d46acc9b9bf44f653afc58f8d3328c00087796c7 SHA-256: 0f658844fa6cc0ce233b4ee7457c0094423136157498e4ce20a50facb2ac75bb
156 Risk Score

Malware Insights

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

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 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=rome+total+war+nocd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5f91bce3e28ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f9f8c81d55be.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/xisilebisisod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f934b39b0df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f9831c341480.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/6613868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f8f30920d23a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5fabc04131a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f972bb899a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f8756afdd2b7.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/welutizenop/berirepalijezeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/nenatokefivimumowax.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/terokapiwudud.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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 5004 bytes
SHA-256: e682fd49bc8f4b0f46ce2c52f66bee25a19de26d951134f934d4ab1c8e108ec6
font_01_sfnt_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 11892 bytes
SHA-256: b0f1712c88c60706b27bc7fc240597da35ab6f31e14c41b69cbf9cf37101a50c