Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f1b2db6680e7f3…

MALICIOUS

PDF

98.2 KB Created: 2021-02-20 07:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dad67dd4d1dbaa1ebfe6c2b23c1d56fe SHA-1: 6f28034b8620c0d2b86ba37aa70e3c07ad84af81 SHA-256: 92f1b2db6680e7f31bbf5d56a4b7849d8122c07b28b1b833a12d5e7e1f4f2c3d
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, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'baarspo.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=mental+state+examination+documentation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fceda07f3aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_6029df096956f.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/qqhf1hb/39431114935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_601756b3cdd74.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/HwMZ1ha/verizon_inside_wire_maintenance_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/MjjPdgg/dwts_2020_scores_week_3.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ih5iicU/70824874659.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/idLtSJE/get_lucky_movie_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/bzgf0WY/sexadu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/gihvigY/36789823178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd3a4823b41.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/gtxDNaZ/62568079700.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/LdhhgjM/73220388464.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paropabaru/draw_entry_ballot_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/52396245375.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/internet_speed_test_ookla_app.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/tofeteroroxarilotifolas.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/doropaja.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/transformers_barricade_mustang_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/yakuza_kiwami_1_rina_guide.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_off00014405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 5060 bytes
SHA-256: 610d211c607b0daae3f4e4f4267e22413e9fcd3f9ef12a13ef67086fc79deb31
font_01_sfnt_off0001553a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553A 11644 bytes
SHA-256: fa97a8994d1de9a38ccfb1d4b0b3bda1f602893be1f084d920b309d24b721b6f

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