Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d85934bdc319645…

MALICIOUS

PDF

65.6 KB Created: 2020-11-18 04:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a490aae29360bfb7ad9497a3f5fb4813 SHA-1: 7448a6883694c55e5726117f9d4bb5f03e4c103e SHA-256: 0d85934bdc3196458681447bd56c560cf4469dea1c12a8ca6f5ad81a35a88d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic. One of the primary external links points to 'https://trafficel.ru/123?utm_term=husqvarna+125bt+carburetor', which is likely part of a malicious campaign. The ClamAV detection and ML classifier also indicate malicious content, specifically a 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=husqvarna+125bt+carburetor
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5faefe9f67f04.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f8f2a7c62010.pdf
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f88200a48a87.pdf
    • https://cdn-cms.f-static.net/uploads/4476140/normal_5fa84d3a2ccb4.pdf
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f9e52e85b329.pdf
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5fb39ee2718d1.pdf
    • https://rixilokif.weebly.com/uploads/1/3/4/1/134109141/5243596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e324a890-f9a7-4793-b291-f1526ec32136/how_to_noclip_jailbreak.pdf
    • https://uploads.strikinglycdn.com/files/01d10360-343a-4360-a747-688657c67741/drill_chart_mm.pdf
    • https://s3.amazonaws.com/lixuduwonifa/principles_and_applications_of_aggregation-_induced_emission.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_off0000c65e.bin
d9647651457ef21cf981e471f70b02c8db1c4415b695f37c15953552783e065a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 5356 bytes
font_01_sfnt_off0000d8b7.bin
c4a82abd86e9bd51992c0b26d6365a2f27fec8353e1cb7780862a950759d370a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 9796 bytes