Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8216dab9c73b402…

MALICIOUS

PDF

79.4 KB Created: 2021-04-21 10:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d2c9dcfeb8992c1aa21570b8e6b174a2 SHA-1: 515d24629e614b367ba3f87577dd76f290eb37db SHA-256: a8216dab9c73b402ead11d0b289be5920aab9594aabe82ae3a174d08d6b1cef4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=orion+tv+remote+control PDF link annotation
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/rejisevevazadina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_604367e619c92.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/PhgYzGJ/car_crash_videos_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/kvjbjji/bupatadokab.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/74ojhcn/85346684718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_60514b900a82a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fe400b962fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/7VZoQJe/jutanaxazuwerejumusiwivav.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/ejj7isI/invasion_modern_empire_hack_no_survey.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/bofawati.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/fhj3Ngi/fish_oil_supplements_liver_function.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/bogetuf.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/3e890a7ea24.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hfjb05r/minecraft_download_windows_10_free_full_version.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/kuzopetugoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_0fbbfde48ea64656be485598788af626.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/bangladesh_is_polio_free_country.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/what_colleges_arent_requiring_sat_for_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/12411220812.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_3f764a815d82443f9cdfa010c4156abd.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_e1e4c0b6c657432693875b7cd940afa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/pesozixamekibikijabudalej.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_10bc03a43e0444eaa306b669a7647ee2.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_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 4644 bytes
SHA-256: 5e4b583053dd88151e6087b5200713fb7c9758d29b272ed3523e740f3153b52b
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10516 bytes
SHA-256: f353f8a6032a173d2296ab81ecaee6d81f867de98afe992f81347368cd1a935b