Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3304667a1a8cd07…

MALICIOUS

PDF

69.6 KB Created: 2020-12-01 19:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09dc0017837a7b3cdc3f777451d08d0 SHA-1: 147cfe02805cfe1962c99957b9c862ea2611d30b SHA-256: f3304667a1a8cd075dbc6f22b313c17f8cb0ed3225159e224421f443f8647b8c
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. One of the primary external links points to 'traffine.ru', which is suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=types+of+waves+worksheet
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/fepimoto-nizibe-kojifigip-pugupegagemipig.pdf
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5f9bd5fb81e34.pdf
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fb01211716d7.pdf
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/4026143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc06d09e5c7695ca9994347/t/5fc104fea97599144e1b80b8/1606485247678/data_resource_management_controls.pdf
    • https://uploads.strikinglycdn.com/files/f262aade-0fc1-4a31-b225-cb3810e2af78/fodixigejegesivixode.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3fdbeaf37e3b64677087/1606303708170/selling_receivables_occurs_when_an_account_becomes_uncollectible.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08da2c6de34c7a3a7149/1606224092013/robegamosow.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf549f4f98375720d72bfb/1606374568190/mini_protean_tgx.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06d36a371610b878b62f/1606223571997/pixel_gun_3d_hack_pgun.net.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f913485235c86bdfb6d/1606377363555/18711384461.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d354.bin
5c60654c826983f839395f1069e0e73d182c368edfc3f3ac2e632cfabd039f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 5224 bytes
font_01_sfnt_off0000e535.bin
62a4a68479f6578bda36b93fbf0a1cf548359ca954c58d101e2ec55acde7ccc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 10804 bytes

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