Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e64affa3e616327…

MALICIOUS

PDF

66.2 KB Created: 2021-02-22 22:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 22da011daaf6ac39abc3278d6f62827f SHA-1: 5de277573abd6a3dc5b868dbfe3552ceffc357d9 SHA-256: 8e64affa3e616327020129e6ce1f0d15dc46c927421caee658a900019580e20a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://bologen.ru/strik?utm_term=nets+of+3d+shapes+worksheet+tes PDF link annotation
    • http://kwini-fini.online/open_file_in_microsoft_paint1dkde.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/zitenas.pdfIn PDF document text
    • http://copyrightproblem.com/the_carnivore_diet_shawn_bakeronite.pdfIn PDF document text
    • http://rezltml.xyz/mystic_messenger_anime_serieszd835.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/969b9a2de12f277.pdfIn PDF document text
    • http://xilegutopeza.22web.org/39767359652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fd9045230dea.pdfIn PDF document text
    • https://xalokelunubame.weebly.com/uploads/1/3/1/1/131163690/e3498b1e66438b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_60294d8e53ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_6027806070e56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexireto.epizy.com/internet_explorer_8_for_android.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/actfl_guidelines_in_spanish.pdfIn PDF document text
    • http://ragoposetetadu.epizy.com/speaking_english_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/panemiwesalevokutok.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/bodaratifelerunezepumabe.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/favuretotak.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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 5388 bytes
SHA-256: c5c6978ae5a687cc53e7d48f63637e81c9f23fa4217ea80d4599a11d0db6bfd5
font_01_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 10256 bytes
SHA-256: c3e4a5ba9da8e5ae07d05d2c9af6f619218814173b71be8ae8116fc0ed3d048a

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