Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9331a17cb40538…

MALICIOUS

PDF

86.8 KB Created: 2021-05-15 08:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8f732b6794bb2672d35567e6be1643 SHA-1: c8d9abd3cd6953c7acf8434b92de7f77b24a917f SHA-256: 4d9331a17cb40538fdc40a4c7e0401798a23cd38cba1d2d13315fdb3c8cf190d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=oxford+style+guide+dates
    • https://cdn.sqhk.co/sazobenapur/ihxow78/chicken_crossing_the_road.pdf
    • http://leledup.mypressonline.com/is_wendys_breakfast_sausage_pork_or_beef.pdf
    • https://cdn.sqhk.co/lamiwifa/aENTgjr/67919483566.pdf
    • https://cdn.sqhk.co/riraxizilob/YGxhgha/studying_amino_online.pdf
    • https://cdn.sqhk.co/zoribakim/dehfgeJ/juzewotopefo.pdf
    • http://tebogekememesij.mygamesonline.org/hindu_boy_names_starting_with_k.pdf
    • http://mugukix.mygamesonline.org/76382318743.pdf
    • http://kugewezebuvigiw.mygamesonline.org/risultati_serie_a_2020_18.pdf
    • https://cdn.sqhk.co/fuxiwimemo/hjjinkw/digital_strategy_proposal_template.pdf
    • https://cdn.sqhk.co/fapolokid/nO1JSih/83596185293.pdf
    • https://cdn.sqhk.co/kosuxatune/Ajaiegh/17192969029.pdf
    • http://fakurivevid.scienceontheweb.net/97320059558.pdf
    • https://cdn.sqhk.co/wujakegu/hdejdbP/hockey_mvp_belt.pdf
    • https://cdn.sqhk.co/tokofape/eAhctZo/wopuritimubibi.pdf
    • https://cdn.sqhk.co/minofavazu/hh9Kpyx/vadinovuxavijot.pdf
    • https://cdn.sqhk.co/bijozugetav/fhh0jeB/wanibi.pdf
    • http://rujisuki.mygamesonline.org/importance_of_studying_biogeography.pdf
    • https://cdn.sqhk.co/woxemumi/JjedmXJ/38059851073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_f014d9f6afe34cd290d1f229e5cee246.pdf?index=true
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_8d13baae677a4058be909be34b0b5a60.pdf?index=true
    • http://gekolutewubel.myartsonline.com/bivavokoziborutijoreje.pdf
    • http://purewowesajumu.myartsonline.com/axiomas_de_zurich_descargar.pdf
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_2f761fd67f174b74bbc87b8ce082412a.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_c4ca3e21caab4b098a86fc52adde4619.pdf?index=true
    • 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_off00011408.bin
e048cce1c69e5d80076110b129752915ae4aa6a0748fd52e3da972e39a97352d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 5272 bytes
font_01_sfnt_off00012615.bin
bd2ddf568998a5a02f9a1acf82175860fc24ffdab58bad7d09263af3304e4dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 11136 bytes

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