Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8166c9a6eeb2c65…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 21:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc107275d4a8b1652b46f51f1265912 SHA-1: b726cda82aee61c48b35012747ceea66ea244ca3 SHA-256: c8166c9a6eeb2c656ebbf8a6329af5cf2467b44ee884487c4750a0a96ec090f5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading a payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=west+african+musical+instruments
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fde78d2a0a42.pdf
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/b264a6c66cfb31.pdf
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fd395c8786f7.pdf
    • http://1freedom.space/passport_photo_template_a4qz1du.pdf
    • https://cdn.sqhk.co/linotepibubi/difiagh/remington_hammer_nailer.pdf
    • https://jorobeperepi.weebly.com/uploads/1/3/1/8/131856290/sileru_rasef_vasituv_zogaxomewo.pdf
    • http://reetodo.online/xetobijapesafisepitijetki4l.pdf
    • http://kupivse.xyz/adjust_thermostatic_shower_valve_instructions8zdlk.pdf
    • https://cdn.sqhk.co/xakurusuk/ifgeJid/onelogin_protect_app_setup.pdf
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/836363.pdf
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fdf7ef118fdc.pdf
    • https://vuvitujenus.weebly.com/uploads/1/3/4/3/134305132/425470b316d12.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/fuveba.pdf
    • https://cdn.sqhk.co/guranotup/ggEjghi/68706032386.pdf
    • https://cdn-cms.f-static.net/uploads/4384639/normal_601925af53864.pdf
    • https://cdn.sqhk.co/nezerozara/LgdDjcJ/15147596603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavapozalilup/wixotimivemakugoruju.pdf
    • https://s3.amazonaws.com/vukusa/kenmore_350_series_water_softener_grain_capacity.pdf
    • https://s3.amazonaws.com/wolina/bawagu.pdf
    • https://s3.amazonaws.com/fosagoba/web_browser_for_android_tv_apk.pdf
    • https://s3.amazonaws.com/zabevog/80366493439.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_off0000fbbb.bin
66e6c134e725a9a05564a5d0397f99e68f17c1199cfd35908d219ae5799b090d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 5040 bytes
font_01_sfnt_off00010cd6.bin
b2463ca35bb03593b2362d868ac38d54e7c5eea7eea6080176a977d4e9faafd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10196 bytes