Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e526a85e6b54e4d…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 19:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8bd6bc5e1902aa89afbfca1de728d2e SHA-1: 35e0e0ab0e2da1e19e2389bea97d4b26e7acc07f SHA-256: 3e526a85e6b54e4d295ee2401b821b67cc3e2174c068c23e426eac0ea9743363
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing activities. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious 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://maypoin.ru/wix?keyword=pathfinder+vermin+companion
    • https://cdn.sqhk.co/ridijafugemi/jfejgjA/65069035963.pdf
    • https://cdn-cms.f-static.net/uploads/4375700/normal_601a2b6473b0e.pdf
    • https://static.s123-cdn-static.com/uploads/4460954/normal_6007e59b46305.pdf
    • https://cdn-cms.f-static.net/uploads/4415739/normal_602dcffc53e85.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe8a5055c31c.pdf
    • https://static.s123-cdn-static.com/uploads/4371244/normal_60013c1c698f6.pdf
    • https://cdn-cms.f-static.net/uploads/4481397/normal_601cc4b07d536.pdf
    • https://cdn.sqhk.co/suxupijisajo/icWWw2Z/sneaker_hd_wallpaper_iphone_8_plus.pdf
    • https://cdn.sqhk.co/nilamemiw/dD8eQno/into_mirror_mod_apk_revdl.pdf
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60156b2b79dfb.pdf
    • http://dunetetemob.22web.org/dupemeso.pdf
    • https://cdn-cms.f-static.net/uploads/4454971/normal_600f1bc1b1e0f.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ffc735adb6d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesopepi.rf.gd/movevekelubojevutoguka.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_off0000e066.bin
9516cb9e43410b0fc61c9abc9bfaa0293a1fad011b8d61d559efe2e40f645ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 5244 bytes
font_01_sfnt_off0000f21e.bin
7e9eb9625fe8a2c689c5cc0f23f8e7d906b016a3bc646fdec9e56ef27381e65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10732 bytes

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