Malicious PDF — malware analysis report

Static analysis result for SHA-256 5647625584436c16…

MALICIOUS

PDF

72.4 KB Created: 2021-01-06 08:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f93cb13dc71c5acd1756dcd35e43afa SHA-1: 7c02730a779b14669dfcf1d568d0d6291a5b7956 SHA-256: 5647625584436c16fbe3c081ca9a0e12b25ad1bd66d199825e5ebceb37c51620
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://trafffe.ru/123?utm_term=subtracting+rational+expressions+with+like+denominators, suggests a potential phishing or spam campaign. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the extensive linking pattern indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=subtracting+rational+expressions+with+like+denominators PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f976c799c67c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcce2763e505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd638e4e6d6b.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/zaxed-worazebowig-majoxedemazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fa2db98213cb.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/htggtji/39866177626.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/2977805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8749f97f273.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/whajbji/build_your_dream_house_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5fe908bb74de7.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/31f13a36-d8ec-4046-9b9f-53942d49de40/fukasiwurizomodoxumiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 5956 bytes
SHA-256: c6928cdf2793d9c0d37623036df85808cd3f968d89e5eae154546691b53c7fe9
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10324 bytes
SHA-256: 8f921c5317b1a343b7a78c3467d1d2e15807b40af5b69362c65e0e8c749cfd01

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