Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17e22042e1e45f3…

MALICIOUS

PDF

85.8 KB Created: 2021-04-07 22:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff209a1329cd25f65821065a04e1350c SHA-1: 6b41c77fdd943f3a610be476921e68ff41d2f21a SHA-256: c17e22042e1e45f39050351d94f1eed354b3b7e8ec11c49aa277c88a9c5e8b78
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly exploiting embedded JavaScript.

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://bologen.ru/strik?utm_term=how+to+repair+black+and+decker+mouse+sander PDF link annotation
    • https://vejifopa.weebly.com/uploads/1/3/4/4/134461381/1167693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_601323c5c9974.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/ruwokuvu-dafen-sowowarizuweg-libaxazufi.pdfIn PDF document text
    • https://pisolapep.weebly.com/uploads/1/3/4/6/134648883/257c94baa1fe0.pdfIn PDF document text
    • https://welusagosa.weebly.com/uploads/1/3/4/3/134355806/0f2539bb8638bd.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/3fd71f8a6a.pdfIn PDF document text
    • https://lidoporovumo.weebly.com/uploads/1/3/4/5/134506542/5cd8993b4459.pdfIn PDF document text
    • https://jumedewumeba.weebly.com/uploads/1/3/4/3/134310957/nizodu-zavuzavejafup-zobowana.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/3847496.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/4165312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fe859b646101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_e479dc66536749eb9949a88989a38369.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_2734c4c82a124e5d95cb0f726afd33eb.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_d01bab024d93410f8478eb7233b9d6c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/blood_groups_genetics_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/avengers_infinity_war_wallpaper_app.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_394979d4f7ac4d20bfc9ca5032e15d94.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9f9ec81a0d7044ccaf3226b4e2d0bb3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/40444762820.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/2006419555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33b5704-b70b-4658-b63d-67deda41ea26/jivekudatutupoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0b06df-5643-4c72-aa63-c6663c259290/45914316321.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/latest_christmas_songs_in_tamil_free.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_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 5476 bytes
SHA-256: a5672125a6080364ffd0adb25a080af5aec294fd3410033da7ed4835a5411ed4
font_01_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 11692 bytes
SHA-256: 08be75a3656a88d89ad038037777b0b6d36d1dff0aa0b8d69a2c61b70e69a884