Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cce9f9daa96496…

MALICIOUS

PDF

73.3 KB Created: 2020-12-22 04:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40a57ce33c89820aa74a82dc78594222 SHA-1: 199f7f80d9c3fa0c236fcc9a8ef37b56d74f6cd8 SHA-256: 45cce9f9daa964968c38b0f31eec8e53b762241f79a768c5db4b435ea9279a9b
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 link farm designed to distribute SEO spam. One of the primary URLs, 'https://trafftec.ru/strik?utm_term=training+plan+strategy+template', is directly associated with the malicious classification. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document, likely serving as a lure for phishing or malware distribution.

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://trafftec.ru/strik?utm_term=training+plan+strategy+template
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fa6fbf16fdd0.pdf
    • https://demomejisalazi.weebly.com/uploads/1/3/4/8/134869482/74b05d3.pdf
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd64c7201261.pdf
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/2469038.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd619d385171.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd194b5bd33a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/99010741-c8c4-4461-a121-aa08bb1c3587/electrolux_t8_bagless_vacuum_manual.pdf
    • https://s3.amazonaws.com/fotepopunaj/battle_cats_hack_pc.pdf
    • https://uploads.strikinglycdn.com/files/9e50b6ec-332f-45a0-b597-4bbe49a02ccf/25999767673.pdf
    • https://uploads.strikinglycdn.com/files/26281959-e3e0-43d5-9eb1-4a620c567419/amsco_chapter_19_answers.pdf
    • https://s3.amazonaws.com/tomaxade/bushnell_rangefinder_repair_manual.pdf
    • https://s3.amazonaws.com/sasufufa/difference_between_medical_and_surgical_asepsis.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_off0000e2fc.bin
51fafb7a7e7afcc4917d143814815f2d92b4b3316122a3c904b8afb34e747654
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5192 bytes
font_01_sfnt_off0000f499.bin
e1c2df9666b7c24eea7ab674940d7fece427ba85723434af7b9629e9d4665d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10620 bytes