Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b978f4eae6d49a6…

MALICIOUS

PDF

63.6 KB Created: 2020-11-09 23:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab0c0dae75d45a29287f19d0d7e83d42 SHA-1: 9e5a27731e000eec22a996660dec7cb92418a122 SHA-256: 9b978f4eae6d49a66eb1da8f92b69d7e8ed7b4b35a8fa89fd111135deb04da02
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm containing 26 external links. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to a 'magazine release for ruger mark 1', suggesting a lure for SEO spam or phishing. The presence of embedded URLs, including one pointing to 'traffine.ru', indicates an attempt to redirect users to potentially harmful content.

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://traffine.ru/strik?keyword=magazine+release+for+ruger+mark+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f9a6730c8319.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/lakoxufinisiwoludu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5f9d829369b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5f9d7c4c7b577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f95fd325065a.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/megulu/zugeseriki.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/2010_toyota_highlander_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/david_bradford_houston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa884a81-1ea4-4c5f-a773-72f8ed34237a/isobar_map_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db07933c-4bc5-486f-9ddb-3f2228a563e7/badegefa.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/madununikotutalimusil.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/toomics_as_close_as_neighbors.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/35781925557.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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 5260 bytes
SHA-256: 319caf3d54b5a34a1bbcfa1590a6f33a337b2479f2426a25dc9304be7df8fd90
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 11240 bytes
SHA-256: b4bd57810be9548c127d8698ad04d125769b5bd4511ef394afd07c6e224789e0

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