Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc44f7d6202e2898…

MALICIOUS

PDF

83.4 KB Created: 2021-06-06 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beda9492bfba9e69dddae0d1eb2353ef SHA-1: 2f3f5786d38ac35f63f1d7969682b4884f9e35bb SHA-256: bc44f7d6202e289802cc994765b288c69a7e0ac9ab9223233ade1d4d030a9b1e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, indicating a link farm or phishing attempt. The document body, though partially corrupted, suggests a lure related to vehicle transfer certificates, which is a common tactic for phishing. The presence of external URIs and a high number of PDF links points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=certificat+de+cession+v%25C3%25A9hicule+pdf+remplissable
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fe3c83f1b457.pdf
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/lipiluvexope.pdf
    • https://cdn-cms.f-static.net/uploads/4375908/normal_605941450c0cf.pdf
    • https://cdn-cms.f-static.net/uploads/4468820/normal_605f7aa86cbc9.pdf
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5feb8732d8db5.pdf
    • https://nugaramavamog.weebly.com/uploads/1/3/4/3/134320686/morogidavosaza.pdf
    • https://static.s123-cdn-static.com/uploads/4424007/normal_600345657b8ca.pdf
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5ff9aa5a6921b.pdf
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fec50433c396.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6058007a69500.pdf
    • https://cdn-cms.f-static.net/uploads/4469136/normal_6064d98ad15dc.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_60123a7dc71d4.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5fdbb73ab593c.pdf
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5fcbf3654c748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a139931-5ed6-4426-910b-0851768bc13f/26160095751.pdf
    • https://uploads.strikinglycdn.com/files/2630d321-1bda-4c8e-8aa8-014db807623d/95014519364.pdf
    • https://uploads.strikinglycdn.com/files/5f330b29-0ebe-4e1d-be5d-8ad6c645a378/jerry_garcia_banjo_tabs.pdf
    • https://uploads.strikinglycdn.com/files/f8a46256-21ea-4d8e-a090-dd8e94e044cd/pipeline_jobs_in_north_dakota_no_experience.pdf
    • https://uploads.strikinglycdn.com/files/4f1be236-65db-4c47-8f3a-f6fe94ee8bb0/this_book_will_teach_you_how_to_write_better.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_off00010478.bin
578061539dcdc5ea7f2f1c5ec97ad2a36e47f08f586e60706316b7a91b023ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 5644 bytes
font_01_sfnt_off0001173d.bin
5f622d193d120e476434a89579c87b37340c4a90bfa08a8e889b55983b14735f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 12024 bytes

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