Malicious PDF — malware analysis report

Static analysis result for SHA-256 3249991224cbe689…

MALICIOUS

PDF

68.8 KB Created: 2020-12-15 19:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5328762d3cc6df9e6d0e005ad049fb1b SHA-1: 517ee60f36d218949c65e6195b020732659b2313 SHA-256: 3249991224cbe689d0168141ceba554bbebd36895d164266a453f59c906c6131
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffking.ru/123?utm_term=pioneer+vsx+820+service+manual
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/d8586.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/dunezaf.pdf
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/lejalapisetuv-nuwofur.pdf
    • https://xubupibef.weebly.com/uploads/1/3/4/7/134742940/rolokut_kemopefanepe_motoxarejuju.pdf
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/dunapire-kupifozol.pdf
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/baf42.pdf
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/kojata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe009908845d092450a12d/1606287517820/shot_by_shot_a_practical_guide_to_filmmaking.pdf
    • https://uploads.strikinglycdn.com/files/be62bd4e-4fe7-4834-95f2-38a6f1379d3b/xavier_omar_the_everlasting_wave_rar.pdf
    • https://static1.squarespace.com/static/5fc0e19dbda9c57a97be1de8/t/5fd001fb10495c0ba9163689/1607467517272/disneyland_resort_dining_packages.pdf
    • https://s3.amazonaws.com/limewub/annals_of_surgical_oncology_submission_guidelines.pdf
    • https://static1.squarespace.com/static/5fc13908affbf90a66ec9ac0/t/5fc2d7284e98326c026ed25c/1606604586479/duruvebidosalisumus.pdf
    • https://s3.amazonaws.com/samopakamefap/sanlando_park_address.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_off0000ce53.bin
e97bd412bda1b159ab1f541b7968e6400e3f530b2a3ca05b1bafa2c9fb9a65e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 5540 bytes
font_01_sfnt_off0000e11b.bin
252ac86a8f2365c037cb98309f552ecb5ebaadb01626cfb12a485c99d995b84d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10936 bytes