Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ded790813ddf9…

MALICIOUS

PDF

74.4 KB Created: 2021-01-18 01:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac62d49ac0cc931cee0124491da5e14b SHA-1: d102d09a5b598c3d6322cc591db37b2fd7ef6fe7 SHA-256: bd8ded790813ddf9ac7113a8867f3b3be3ca9ade75d60767c75ee8be2caf45cd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/123?utm_term=red+eyes+black+dragon+deck+card+list PDF link annotation
    • https://cdn.sqhk.co/zoboxoba/bHjehbM/cod_modern_warfare_battle_royale_leak.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/VjgPPgQ/timomipemi.pdfIn PDF document text
    • https://luvuzinek.weebly.com/uploads/1/3/4/5/134502649/867a7a64cc07f5d.pdfIn PDF document text
    • https://benoralegofalaw.weebly.com/uploads/1/3/4/5/134581061/pexoj.pdfIn PDF document text
    • https://demepitogiwod.weebly.com/uploads/1/3/4/0/134097880/2525469.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/2781199.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/33b2810752963.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/gDDOgja/detention_center_philadelphia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/spyro_the_dragon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/kaxikusawet.pdfIn PDF document text
    • http://zubeleboju.epizy.com/19866988103.pdfIn PDF document text
    • http://guwivuvasexi.epizy.com/10161684742.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/22552399008.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 5420 bytes
SHA-256: 0fda176c62abb4de97156676929a64d3df1f7cb69f58f6f90dfed5633e859607
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10912 bytes
SHA-256: 7172a66b939646183449fbc1136f684ae1052a382b640f2f7c0beb318fa1be09

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