Malicious PDF — malware analysis report

Static analysis result for SHA-256 3738f6ca566ab9db…

MALICIOUS

PDF

69.0 KB Created: 2020-12-19 15:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fb74465bcb8ae9d0f3f9d04fc6ae7a SHA-1: 7515675cf54a78120669e417dce711b3214dffe9 SHA-256: 3738f6ca566ab9dbf35d0e889ce82a10bad846072ef28dd1516ebfed76907f44
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one prominent URL pointing to 'traffking.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/aws?utm_term=arm+template+depends+on+condition
    • https://vesexifog.weebly.com/uploads/1/3/4/4/134491049/wukobekuvofizeziwes.pdf
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fbfb21ddb8a4.pdf
    • https://gipusarele.weebly.com/uploads/1/3/4/7/134708700/8295817.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f91237e9e46a.pdf
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f923da04e132.pdf
    • https://piminudoligot.weebly.com/uploads/1/3/4/6/134688392/f07c0861c45.pdf
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/bobuxe.pdf
    • https://fuduxudeki.weebly.com/uploads/1/3/4/6/134606049/2605029.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fd102d4ac6eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a9193ff0-fdb1-4ae9-a573-3b18cf70fac2/words_with_er.pdf
    • https://s3.amazonaws.com/gorajikunobixi/50232395178.pdf
    • https://uploads.strikinglycdn.com/files/86b6cdab-898a-4770-b279-73636632e46e/aquatech_5_15.pdf
    • https://s3.amazonaws.com/dinilederu/46635270248.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_off0000ce84.bin
639e248ea6cf6468084c65a5b04fdd838690e0a9270041f4f2ac6800b17e6578
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 5208 bytes
font_01_sfnt_off0000e020.bin
4cd659d87c88f7993b3e3e2f178e7dce3a9b02c7bc74c909c23f16d718874f6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 12240 bytes