Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b34d199568445bb…

MALICIOUS

PDF

65.9 KB Created: 2021-02-15 00:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5733ba45b6c19f9bf473e817ece42217 SHA-1: d3b2fae151366e7e19f83c1a22c9451e052a1822 SHA-256: 5b34d199568445bbcc55c4961ee03d68702623cb8be6e71cee9f680bf92d3c94
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a malicious payload or conduct phishing activities. The document body, though heavily obfuscated, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/wix?keyword=rational+exponents+simplify+worksheet
    • https://cdn-cms.f-static.net/uploads/4446500/normal_60215caab4f36.pdf
    • https://cdn.sqhk.co/xovenekot/jXijjjU/defender_16_personalities.pdf
    • https://cdn.sqhk.co/femelofep/ftZTDLr/fikupebidirizubutili.pdf
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fc8d9ddea9e5.pdf
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ffd20cb6a741.pdf
    • https://cdn.sqhk.co/jifigetuxu/jez3jjz/9334543244.pdf
    • https://cdn-cms.f-static.net/uploads/4423166/normal_600d97ec9fe27.pdf
    • https://static.s123-cdn-static.com/uploads/4487658/normal_6003a0fee2719.pdf
    • https://cdn.sqhk.co/mabisurud/igRmhfC/soluzotedujuzefajo.pdf
    • https://cdn.sqhk.co/jaxabofapuw/bHiegei/space_rangers_quest_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ff5f32122944.pdf
    • https://cdn-cms.f-static.net/uploads/4460708/normal_5fd78c3ca5776.pdf
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ff9f462b93c7.pdf
    • https://cdn.sqhk.co/ginijetemepa/ejdjhjd/15987410832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotogorurekuro/samsung_s9_review_android_authority.pdf
    • https://s3.amazonaws.com/dazovosugev/asphalt_nitro_mod_apk_apkpure.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_off0000c63f.bin
53df70f1aba35c280096b6e1495dd39b204b6436044bd44426163b604d566d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 5476 bytes
font_01_sfnt_off0000d8d6.bin
d73c133c94c24cfa12268017755b92be005959150bb2a0cd428c4d695f86bd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10212 bytes

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