Malicious PDF — malware analysis report

Static analysis result for SHA-256 20941fe9cd8626a8…

MALICIOUS

PDF

85.3 KB Created: 2020-12-02 19:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 916c8f14e8cbfabaae395378651f56ba SHA-1: 6d1c2666bf0ff509fff80e7d62a939601a965aeb SHA-256: 20941fe9cd8626a80b4d8b3ef1746887d947bb5531bb1e55eff9df3e32ea904a
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffking.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to TOEFL resources, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=toefl+writing+template+toefl+resources
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fa2b3cb2eb57.pdf
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/5156358.pdf
    • https://vaxonarug.weebly.com/uploads/1/3/4/3/134378521/79471369401.pdf
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/9245566.pdf
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/7881257.pdf
    • https://pozuzedik.weebly.com/uploads/1/3/4/6/134668333/4050450.pdf
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/wezevelalezomukoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d41e8c6-1eae-4ea2-ad66-810fd086bd1f/73736932347.pdf
    • https://s3.amazonaws.com/ritoma/xijolobereteworu.pdf
    • https://uploads.strikinglycdn.com/files/a2759d39-ab01-4fc1-ad9d-11941f0bea78/14797663346.pdf
    • https://s3.amazonaws.com/xonaxevetaf/wuvukixesurupa.pdf
    • https://uploads.strikinglycdn.com/files/11a0fbe0-19ce-4c83-af99-fc2c94640b41/vutoz.pdf
    • https://s3.amazonaws.com/regufojalojaza/biblia_de_estudio_explicada_concordancia.pdf
    • https://uploads.strikinglycdn.com/files/d2849412-83ab-4e64-bb2a-7a9671f0841b/libro_de_matematicas_de_1_de_secundaria_editorial_castillo_contestado.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_off00011152.bin
8e53e551c810a4dd057dd6cf48abe053f7ebc3a888e58d0ccb21f78f77950404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 5376 bytes
font_01_sfnt_off0001239c.bin
fb4aaec93b7cf61ed069f97989df28e1ae7e6e4eae52e81c9c299f0f87a39cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 10712 bytes

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