Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3754600de84822…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 04:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a55b3edc331a126c2f124d051de9fc SHA-1: 19e77e46e5c10627e54f0f0a70fe8258c1e315e5 SHA-256: 6f3754600de848223d406487d0c7a8b89c3349733f79425f783c55982b2f81b6
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to a suspicious domain, zajinet.ru, which is likely used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URIs and the overall malicious classification strongly suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://zajinet.ru/aws?utm_term=what+does+it+mean+if+you+fantasize+a+lot
    • http://mopebiz.22web.org/keraguxixoxesizovoxizebi.pdf
    • https://cdn.sqhk.co/duditizonut/oljc7if/65728965569.pdf
    • https://cdn.sqhk.co/sujubowip/Hif9Wih/44231894309.pdf
    • https://boderaraza.weebly.com/uploads/1/3/1/4/131454415/3515026.pdf
    • https://cdn-cms.f-static.net/uploads/4499023/normal_6061c8859d144.pdf
    • https://cdn-cms.f-static.net/uploads/4412161/normal_604bc65ec47f1.pdf
    • http://crispyset.online/5008902439dir9u.pdf
    • http://zenelis.iblogger.org/changing_currency_in_google_sheets.pdf
    • https://kebonipima.weebly.com/uploads/1/3/0/7/130740513/6743676.pdf
    • http://sijowusim.22web.org/saxon_math_course_1_2018.pdf
    • http://tafuvomilo.22web.org/52704230853.pdf
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/fumeribax.pdf
    • https://cdn.sqhk.co/jelasusoved/vig4Cig/kodex_epd_mapping_system.pdf
    • http://interior.estate/panasonic_australia_support_phone_number4m2b2.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/tedunobiwopexesuv.pdf
    • http://smartline58.ru/nfl_free_agents_2021_washington_football_teamtyz4c.pdf
    • http://goodsun.fun/who_were_the_martyrs70mto.pdf
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/c1b8d7b4cb.pdf
    • http://budivev.scienceontheweb.net/earl_nightingale_19_minutes_checklist.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pikubub.onlinewebshop.net/bootstrap_4_tutorial_point.pdf
    • http://viwuwijagabote.myartsonline.com/42745163771.pdf
    • http://mojozore.myartsonline.com/adobe_printer_install_windows_10.pdf
    • http://rabatelekovufar.myartsonline.com/fundamentals_of_communication_systems_1st_edition.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_off0000fa1c.bin
37074b50e5ed486647aeccbffdf259c0452d2fb90637c2e0473f7ce59dffdb45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 5216 bytes
font_01_sfnt_off00010bd8.bin
a8e41bb9ae413d8d42f0e92feeee8650ec787bf9752eaf2c9dc298fcfd43ee9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 11040 bytes

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