Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2dc187cbe985e3…

MALICIOUS

PDF

70.3 KB Created: 2020-11-13 12:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e77b29bf8c5e2059247fc6dece0ff3e SHA-1: 1c064b7b6e449202aedf3be13bb6a46ae1b15aee SHA-256: 9a2dc187cbe985e37439b4ba4ec107e772c96c68efffc97e29c80174a0277a40
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent external URI points to 'https://trafffe.ru/123?utm_term=ny+state+regents+2020', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=ny+state+regents+2020
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fa36fed15c79.pdf
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/3658150.pdf
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/tasolavus_dafewo_keweponetovux_pavuwokilulon.pdf
    • https://cdn-cms.f-static.net/uploads/4444378/normal_5fa83186d8c2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f65837b3-4df0-4a3f-9152-0f0388f74e16/vabexefo.pdf
    • https://s3.amazonaws.com/kisagoz/94313573126.pdf
    • https://s3.amazonaws.com/patotale/rifug.pdf
    • https://s3.amazonaws.com/ladojenefe/kuzasagasowelipe.pdf
    • https://uploads.strikinglycdn.com/files/506fbaba-cdbe-4805-8b5a-6a7d81ee37cf/sm64_rom_hacks_list.pdf
    • https://s3.amazonaws.com/vuforewebub/bienestar_economico_definicion.pdf
    • https://uploads.strikinglycdn.com/files/adf1903a-fdb6-419b-873f-b94f999a5b13/78380310766.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb33.bin
302225f870c8df8591d42229347b2a71104075ae70389ec7028b42b3a6a24b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 4796 bytes
font_01_sfnt_off0000db83.bin
9ea146ebd4e3343029b6817b4981b144cf4b3bdd77a63863bdcb6cfe42245b71
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 10232 bytes
font_02_sfnt_off0000fe4c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 4324 bytes