Malicious PDF — malware analysis report

Static analysis result for SHA-256 117d51134fb954a4…

MALICIOUS

PDF

61.8 KB Created: 2020-11-16 23:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9f4bf9f673bed989a8102a7cfe18148 SHA-1: ddfaf6d8dd10bbf38efe4cc2eb704cf67e9b5a81 SHA-256: 117d51134fb954a411ca22cdad7792e3aa31e755a3b6f30867b4188ce1dbf5c2
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-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.
  • 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://traffnew.ru/strik?utm_term=2+and+3+letter+scrabble+words+with+f PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5faf0ec373389.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/bulibufusutenem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f90ebdd08dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fb291dc07fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5f9ebe87a9725.pdfIn PDF document text
    • https://majaxufekebobuw.weebly.com/uploads/1/3/4/6/134605083/95361.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/xuwasafirivu.pdfIn PDF document text
    • https://pofaleronuk.weebly.com/uploads/1/3/4/7/134722597/c5db6c75533db68.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/7f0e2e9e-b7f4-414f-b868-64a2d6cf6481/words_that_start_with_hexer.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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 5540 bytes
SHA-256: 1baec933de5978c552f65a47cd21badc9717f210ef87f5f4d4b8e47e25bd1910
font_01_sfnt_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 10932 bytes
SHA-256: 4459d378ca5512ae88e4d3da5447f755e17b470e0fa1ab9a7d4140b4d80de7c2