Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b76ac9cd1c6b4a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 07:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 903cb4416f0067dfe74adf835439415f SHA-1: 72b8ff6045dd7d584092853f2dc5448c4b3841b6 SHA-256: 96b76ac9cd1c6b4abfe33e0b8836052acfd75ee7fdc0ef12c01df9c9e0f9f772
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru/strik' and a search term related to 'Diablo 3 speed farming'. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious phishing content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=diablo+3+speed+farming+demon+hunter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5fc9cfd0d3b90.pdfIn PDF document text
    • http://monofijejawajo.iblogger.org/auricular_therapy_a_comprehensive_text.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_6054b3caac6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_603d2e7e070cf.pdfIn PDF document text
    • http://doxigedugovo.22web.org/drive_bematech_mp_4200_th_usb.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/iige0hj/dragon_ball_super_intro_latino_letra.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/gxRZygd/clashnessie_tiny_house.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/djj0mgc/68390158895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffceff75df66.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/caidzhh/xekabowisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_602ca346b4a97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_71ef5299932c4ee7a4acd0788bce1cd9.pdf?index=trueIn PDF document text
    • http://jesitari.epizy.com/que_es_la_tecnologia_5g.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/how_to_use_fender_mustang_lt25.pdfIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_bad3029abae847f99ae8255b84eb956e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/sawunupas.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_7ef5fe53e4f440ddaaac1164a35873b9.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2694e9f9a28b44f6a7c073f27ef37d2d.pdf?index=trueIn PDF document text
    • http://livofikozenaduj.rf.gd/fewugodugawuguse.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/jidiwejowupe.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/wuxuwazupolesobo.pdfIn PDF document text
    • http://leneter.rf.gd/how_to_download_starbucks_partner_hours_app.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_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 5760 bytes
SHA-256: c619c35e3638e4f08bf57a33ff0576e5ff2cbe04c56619e33c0e3aedd33db440
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10876 bytes
SHA-256: 63561249be7c7ea05bfcfd691e3b12b817016bd72d22dcdeecad0e87f47617fc

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