Malicious PDF — malware analysis report

Static analysis result for SHA-256 4babb07ce07b1e52…

MALICIOUS

PDF

68.8 KB Created: 2020-12-24 06:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f770ab64b8dd97ed959a5b040e75c1 SHA-1: 534a3ee8271a5c629416eea29dc540b2ee502054 SHA-256: 4babb07ce07b1e528d3856efeeaece125a881ee5799ffacccb837d29b7a43d9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://trafffi.ru/strik, likely used to host a phishing page or download further malware.

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://trafffi.ru/strik?utm_term=wynarka+off+road+racing+2020
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/6649605.pdf
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/nunaged-gixiz.pdf
    • https://cdn.sqhk.co/xuwisagilevi/EzgzYgj/4694461373.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7b067150-55fd-4fa1-9dd9-7f33280eb2c5/86330846518.pdf
    • https://s3.amazonaws.com/wurivuve/logo_quiz_answers_level_44.pdf
    • https://uploads.strikinglycdn.com/files/e84b6c1d-94d3-488a-87fe-d146ec1d44b4/what_type_of_organism_is_a_heterotro.pdf
    • https://uploads.strikinglycdn.com/files/8ed679a3-9041-4017-a5b6-9417d9ccdc6a/dr._john_discography.pdf
    • https://uploads.strikinglycdn.com/files/9a4d46bf-68db-408d-9623-b7ccd6c959b6/uptown_theater_napa_capacity.pdf
    • https://uploads.strikinglycdn.com/files/461ef7f7-bd27-4cd0-8da0-bc5b2ef6c01a/86738852098.pdf
    • https://uploads.strikinglycdn.com/files/96137c7d-5b4b-44da-a2b6-64c765dfa0ff/39372246226.pdf
    • https://s3.amazonaws.com/tesapibebujep/dota_2_underlord_hero_guide.pdf
    • https://s3.amazonaws.com/pomaxa/balance_sheet_income_calculation.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_off0000cedc.bin
7f69d7d2bdf0edad6446607ede5f7d135240264ec1385b67c5ddae3016a57658
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 5432 bytes
font_01_sfnt_off0000e186.bin
9b943411998745e276851cd563c937949d7d1c46310eb307846c1e0574dd7381
pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10904 bytes