Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f0251a3b9239c6…

MALICIOUS

PDF

85.0 KB Created: 2021-03-07 06:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6831319180e6978d9c55235879eae0a SHA-1: 75c413360832f4c767c9d7127c8569faa8bb3e22 SHA-256: 63f0251a3b9239c659185f16d74cd1effc43a513987718e82e1cad0b605ec53f
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a phishing page or distribute further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious PDF creation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=millers+falls+miter+box+74+c
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5ff76f3cdbb1a.pdf
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5ff57844950ab.pdf
    • https://cdn-cms.f-static.net/uploads/4406820/normal_603d5c0597587.pdf
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5fe2f2ed6df20.pdf
    • http://rugegav.mywebcommunity.org/do_english_pointers_make_good_family_pets.pdf
    • https://cdn-cms.f-static.net/uploads/4408879/normal_603d036683202.pdf
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fdf66933d54c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wemupajese/irctc_login_id_app_free.pdf
    • http://tiwatimab.atwebpages.com/94104716768.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_29ab0589f35140d699b30cba27b3b139.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/xavexuxelofim.pdf
    • http://gukutimaguvuzum.onlinewebshop.net/sistema_mexicano_de_alimentos_equivalentes_2019.pdf
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_74b801a1c10c4ec6884302aa2345a01d.pdf?index=true
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_2a705db0794946e998c9b83102b1a328.pdf?index=true
    • https://s3.amazonaws.com/lijopavexanuse/rubirikukegoxizavexigebo.pdf
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_59f4f0cd349749358eb2119930c9d466.pdf?index=true
    • http://namepafubi.atwebpages.com/winojarufiseno.pdf
    • https://s3.amazonaws.com/tumasun/identifying_forces_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/tubukeganuji/photo_background_apps.pdf
    • http://sebokegekesuded.atwebpages.com/cuisinart_chw-12_automatic_coffee_maker.pdf
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_54e5a79451774b10a3829e54f80c8c20.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ec.bin
10dfe1a54e8555ae56ba51941e8484916d5ae785649ac3644a77595b6a068b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 5408 bytes
font_01_sfnt_off0001184f.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 1800 bytes
font_02_sfnt_off000120dd.bin
e83369f8170f2f082ba238d791e28f579c5cc5f93b0e6f1e225c5ecd0c11bbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 10904 bytes

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