Malicious PDF — malware analysis report

Static analysis result for SHA-256 1337adaa639e4a96…

MALICIOUS

PDF

77.9 KB Created: 2021-03-02 19:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ac4c19d2bc4d11f3ad456ec4fe733a5f SHA-1: 3e16b22b6dcb6f67c8fcd59ef97c2657f9ae54e9 SHA-256: 1337adaa639e4a966e5050bb6883fd77083a0da3e71abf95f90af4e2139c06c6
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=pistol+drills+at+the+range PDF link annotation
    • http://dosaxixapaxa.medianewsonline.com/mubesesalilos.pdfIn PDF document text
    • http://creditreportusa.info/wapuwamulb45u6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5fe7e634764f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fd198884a8af.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/i8jdEie/71231469193.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/7q6sZhb/deathrun_portable_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_600b4fbb8ed89.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/kegjPih/the_legacy_report_stock_picks.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/igwjagh/moveja.pdfIn PDF document text
    • http://strapslap.online/pidenojixufububwvjl6.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/hlngcjd/50872228807.pdfIn PDF document text
    • http://weinmvc.net/google_sheets_how_to_wrap_textfhxk7.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/92160878469.pdfIn PDF document text
    • https://cdn.sqhk.co/lagexodefajo/jhhfia1/wechat_welcome_message.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/depovisepuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazatirademe.rf.gd/scale_drawing_worksheet_7th_grade_answers.pdfIn PDF document text
    • http://nunowezowijoper.rf.gd/laptop_or_computer_which_is_best_for_students.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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5088 bytes
SHA-256: a9909f590efb1ed3f2252cb3915b65ab485bfb2646ceb1e9b529dc924fd28689
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10904 bytes
SHA-256: 7b7357edd4ebfe16ab07d0aa57e1e8bcc1d68e3e94a5d014dbc4ae31b14b7716

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