Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfb726334e17a21…

MALICIOUS

PDF

80.0 KB Created: 2021-05-25 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc049ba6eac68d849c062cd0abf6433a SHA-1: 21371a13ec9d560c68c80efc98f6eeb167ec6959 SHA-256: 3cfb726334e17a2190d2c344611328927c7aef8c4a52aad194a395c843ee8c34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL leading to 'dafemum.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=watch+free+dc+animated+movies
    • https://cdn-cms.f-static.net/uploads/4419412/normal_600d91ce4b2bf.pdf
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5ff2b9ed53190.pdf
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/9069219.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/jamawofezugep-gipadefa.pdf
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ff587d02fb33.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_6059baaeda8de.pdf
    • https://cdn-cms.f-static.net/uploads/4455886/normal_60327fb562c2c.pdf
    • https://cdn-cms.f-static.net/uploads/4458826/normal_605b86282be85.pdf
    • https://cdn-cms.f-static.net/uploads/4453100/normal_6016e4edd8000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexesazaxasa/niwilijuvesawurevelozapam.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/52863837898.pdf
    • https://s3.amazonaws.com/dazifozixawus/is_wing_chun_effective_in_street_fight.pdf
    • https://s3.amazonaws.com/fajetufekejo/how_to_charge_i12_tws_case.pdf
    • https://s3.amazonaws.com/gotenukevepunin/bijawakisomopomure.pdf
    • https://s3.amazonaws.com/zozuxukoxo/japofadojago.pdf
    • https://s3.amazonaws.com/gajabedafot/boone_and_crockett_whitetail_scoring_guide.pdf
    • https://s3.amazonaws.com/fosalizuzu/tixixozoboxisozisebujusag.pdf
    • https://s3.amazonaws.com/xoguwavosuje/88355298830.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_off0000fb44.bin
b789be7b9eb0992fc64b7b79d22c13e8f91dcc6cb73a75a5c74c0c8e59640fce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5300 bytes
font_01_sfnt_off00010d36.bin
07360547285029828ad53f263612d116504cf424fea775e104004a08c26e0e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 11028 bytes