Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2ff0aa86756b2d…

MALICIOUS

PDF

82.4 KB Created: 2021-04-15 09:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5672b3fee6dc9a727cd71df443dd15 SHA-1: 2cfb2e0d4583a1b2dba56e6dd79644503044e075 SHA-256: 0d2ff0aa86756b2d7dd3134bdeea591512b235ab18f9c5b35521d4bc07080e49
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO spam tactic. One of the primary external links is to 'ponafet.ru', which is likely malicious. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=what+is+f+statistic+anova
    • https://static.s123-cdn-static.com/uploads/4450434/normal_6003e8d469604.pdf
    • http://pornbustyvids.com/60320447643lpsps.pdf
    • http://tufodudem.mypressonline.com/ansys_apdl_book.pdf
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/jezuzusodabega_desukozowagu_tevupubivi.pdf
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/231931.pdf
    • https://peneredexamoje.weebly.com/uploads/1/3/1/4/131407565/4688787.pdf
    • http://vvinorama.website/bitililerokelujmjgly.pdf
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/risopovotep-sisovo.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_603a6ceee2e55.pdf
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/8e3699.pdf
    • http://itayoga.space/980532840538imt2.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60585af213601.pdf
    • http://lotibamuzuti.scienceontheweb.net/anatomia_de_la_arteria_carotida.pdf
    • http://chambre.xyz/edexcel_igcse_ict_revision_guide7exnn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_997cca97bd184c8688124699fa83d755.pdf?index=true
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_20d7d166ea2a47ec99f4f9050054805d.pdf?index=true
    • http://varirojemixu.myartsonline.com/the_process_of_technological_innovation.pdf
    • http://tuminexozuvino.atwebpages.com/20516544725.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_off0001034f.bin
a80b58e87c4c0e7b5ed438dcb7e01091dda8585d883221cb324b1751cfe04484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 4916 bytes
font_01_sfnt_off0001141d.bin
14f9a2e7e6b354e99d0541503f17ba6abfd7bd0797d2df09460d29cb9c845286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 11736 bytes

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