Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f23ad7b286bd95…

MALICIOUS

PDF

89.7 KB Created: 2021-04-13 23:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 06d53376edee13a17807bdc90d32358c SHA-1: 7d6823f0bb06d9a87c7d04162e3922f00245ca07 SHA-256: 02f23ad7b286bd95bbe3703b3f77ab902f0bf53375b5130a6eed3ff04721a9e6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=mordheim+skaven+warband+build PDF link annotation
    • https://xalonekeroritaw.weebly.com/uploads/1/3/5/3/135329664/mokoremimatesup.pdfIn PDF document text
    • https://renupipa.weebly.com/uploads/1/3/4/3/134383378/8b7460.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/073fbca70b41f2.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/jenisozazewubo/black_anodized_perforated_aluminum_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf87539-d063-4976-9df2-11eaa43cb048/tinopinoris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12bee1e-2449-4f7b-a877-291437919d3d/lodepojoxuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490e64ce-4d53-4ef3-b41c-ae0d528bca35/6568367176.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/13977993019.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/40968984815.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/89551519630.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_e9364e015d1d4b4b885544c6b463ec34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afb2bd1-1ba7-4279-8c3f-74774a9efdf0/18051945450.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_278288e2a74847daa17c09ac709ee7e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da2d257-ce9a-4a07-87ed-e31bb9624b00/game_show_network_app_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/96332920788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac518d2-f7ac-43bf-a53f-e540a846af2a/is_cyberpunk_2077_cross_platform.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_7bd8fb6c72364d638b8c2357602b8876.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f8342a-3ed4-496f-ad0e-7c0024582572/25304282345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d219d94-9a16-4325-956b-6942b4914c28/sakodejigisonaserosabedu.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_ef9993e7cbcb4e029ada2bfa915bd255.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najipavez/24109789935.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/59416502525.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_0111090800294f0391fb8816c7ff8bc5.pdf?index=trueIn 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_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 5424 bytes
SHA-256: e9c300cc458bef92c3f655215194d084dac9d0d57be5329e077de3b981044cbb
font_01_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 10744 bytes
SHA-256: 25a7e52a1ff150b8a405239ae2c1568afde6ff8a6cb140eab00800a616311c38