Malicious PDF — malware analysis report

Static analysis result for SHA-256 934edf551b285e65…

MALICIOUS

PDF

78.5 KB Created: 2021-02-16 10:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2104ea4899acd27db94842d5e2a178df SHA-1: 0ae3e7b58c169abdb28e625249cf4ad3e1e4db73 SHA-256: 934edf551b285e65bf775fc0ce6d67c6a6440c06fed83c2e35cde60c19ec01ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious or disposable domains, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=sandy+valley+local+school+district PDF link annotation
    • http://trenketo.buzz/508872495041ypav.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/gjgigeJ/7527305858.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/ihajdA2/18501434012.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/vovixevamujizaletufufi.pdfIn PDF document text
    • http://blancer.xyz/7949994919qdkg.pdfIn PDF document text
    • http://arthromedro.xyz/dragon_ball_z_free_episodes_downloadrjqvh.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/oihgghd/.pdfIn PDF document text
    • http://marketitaly.info/finakaloy0ql9.pdfIn PDF document text
    • http://peludofnor.fun/uphill_rush_water_park_racing_hack_apk_downloadx29bl.pdfIn PDF document text
    • http://lorenbayi.com/basic_business_statistics_13th_edition2s07q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kinamanerat.epizy.com/libro_business_model_generation_en_espaol.pdfIn PDF document text
    • http://bemeridalazobox.epizy.com/40281013563.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/mr_coffee_espresso_maker_manual_ecm250.pdfIn PDF document text
    • http://tefefusojobus.rf.gd/39659425416.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/69309092550.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/yahoo_answers_ouija_board.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5080 bytes
SHA-256: 4cbb9c6eb728897e74c459b660123ba8f0581f46dfba27865afca19deec4ba49
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 12136 bytes
SHA-256: 45247770975445cbf48d99a1179f6199ac7a767d8d2f5670bed0138f80c3b14c
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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