Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a28b16bbe64ade…

MALICIOUS

PDF

61.9 KB Created: 2020-11-18 18:22:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 84fbf6ff6931e4f9c5c27e944e507c8a SHA-1: 961599f3ff51ca584904aa076cc064b8939c99e2 SHA-256: 76a28b16bbe64ade1dfaa06ecac11ed9aad541956cd5fccef136131405e36738
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 0.9995

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://traffset.ru/123?utm_term=skeleton+creek+patrick+carman+pdf PDF link annotation
    • https://nogefarixuri.weebly.com/uploads/1/3/4/6/134647247/0f44a46d5e.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/wunatu.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/sifezoxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f91274b0e018.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/9792976.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/f7a48c7d-e712-4aa5-9768-83e3ab66652f/43282945860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75cd772-3af2-43e3-b10e-1684926191ee/josejulujomevudidob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/270547a1-a001-416e-b75d-cddae02aeded/vitazizemebetemilawotex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d060a617-976e-4c99-89c3-e3a5f80ce07f/30785823853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9903952-edd6-4227-bdd1-f6a300a1e9ad/dazajofiliruronezugorar.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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 5288 bytes
SHA-256: 837aa9a65a1eb110d58a47c873335e26a5222621558a93497157307f501e1fcf
font_01_sfnt_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 9936 bytes
SHA-256: 189bfff82d42c279e8d2d6206af2aa887be060b3d24f8186222f7146d49ce1f6