Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1f096479a29ae0…

MALICIOUS

PDF

97.3 KB Created: 2020-12-03 00:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 24d4d437c8b0bc8c200709bd2114565c SHA-1: 08095d6aed9d4ba750338e3697d17a78dc22cba3 SHA-256: 3c1f096479a29ae018d2233c467f42c6639c09602870ad8de0ecdd856d1fbc63
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=skyrim+thief+stone+console In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_5f936f23ed57b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f93aee6b79a1.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/bunavejolug-zanipir.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/5a5f0191481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5fbe51810110f.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/1958050.pdfIn PDF document text
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/dikonu-tomab-duwukuporagur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f9e92055ac6b.pdfIn PDF document text
    • https://zuzimarubafa.weebly.com/uploads/1/3/4/7/134712841/pibiralunudebipebik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fa05cb28f232.pdfIn PDF document text
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/gilibew-sozima-dutolidewufub.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/tomaxade/xizimurisuwalus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf2de3fdc31513a0eb6b9/1606218463248/bovarafokipijuviket.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/splashtop_personal_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 5180 bytes
SHA-256: 1cba94dcb838d3b120dd142274d02b81bce9ddd4748a2c8529902326b040ee11
font_01_sfnt_off00013b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 11760 bytes
SHA-256: 977a1869c2c257c7ecccb6a0640ca035f22668304a1459b6d6c079e9c4f9ac83
font_02_sfnt_off00016311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16311 16060 bytes
SHA-256: d93486909b7b994453b56cbe9ba86e805d8164129d42f4c52ef98bb3f1ec5a26

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