Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b5d0dcd8181233…

MALICIOUS

PDF

91.6 KB Created: 2021-01-06 10:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e4fce13c99a9ea5c13a2882f30e0642e SHA-1: 70c18f9fad809071f2d9bbe0f07d8cd6b151f2f3 SHA-256: c5b5d0dcd8181233e06c343b34e0436171fa02916d3142ecc3b2be361cd2e8c2
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'traffset.ru', suggesting a link farm or phishing lure. The PDF_SEO_LINK_FARM heuristic firing indicates a large number of external links, likely intended to direct users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=ionization+energy+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8d4fff5f81a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f86f82cbb061.pdfIn PDF document text
    • https://cdn.sqhk.co/develezuwa/thbKgjE/matrixyl_peptide_serum.pdfIn PDF document text
    • https://sererepe.weebly.com/uploads/1/3/3/9/133999843/45697072.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/ffe34d61-66ba-4f9d-b9f2-75e53fb1bbc6/gemidenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48419221-3b5e-4c08-bac5-efb2bc4c114a/nogokezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf8d820-bb78-4e08-b487-473bf637529d/panasonic_tc-p50ut50_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bdf39e5-30a4-41c4-9419-f4e7280c73da/zotisetirozas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1015a8-3227-4b09-983f-af7e57f21949/41650519496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a19f8b-111e-4026-b2d3-9abfaab7bfd3/17805076259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676d85e7-c327-4ca6-baf4-92d51e92af15/r717_refrigerant_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d965be-690b-463c-8b35-3ad08e5f78e8/25755172105.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_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 5160 bytes
SHA-256: 7c5bb6e9335efafcb523e6b74081f0bd5ece48493c4a3524eeca562f5ed47701
font_01_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 10792 bytes
SHA-256: fdaba2021fd88e9d6f36c9094782bbcb06728c122880764e52c7b18ace43dd03

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