Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6418bfe1834eba4…

MALICIOUS

PDF

81.0 KB Created: 2021-02-28 23:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0e4324f2c89dfa296c01bbe8bf952cdf SHA-1: 3e086e53871ee01a462fc1efdbdb3d8f8ac1a856 SHA-256: b6418bfe1834eba485f5686fe5f9b5f4e71a375c26566c2bb87d2db355a15e92
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=what+are+the+7+dimensions+of+organizational+culture PDF link annotation
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/4953986.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/pofan.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/jobejow.pdfIn PDF document text
    • http://migerov.xyz/home_automation_using_arduino_uno_and_wifi_moduleb7bu1.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/XqjcMij/92244070934.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/hihbfhj/ant_radio_service_samsung_android.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/9818443.pdfIn PDF document text
    • http://avit0.pro/lifo_and_fifo_solved_questionsvavmg.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/excelsior_definition_greek.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/dudonopulubomi.pdfIn PDF document text
    • http://cosmicgig.com/xuvegun9862.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/en5mhgd/star_wars_mandalorian_cast_episode_4.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/gihhAhg/show_me_bowling_shirts.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/3f653cfd.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/hg9Gqij/vozaludojaror.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
    • https://s3.amazonaws.com/jedaxopopuko/sowimox.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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 5460 bytes
SHA-256: abd9c1f4ad9ad8737b3f49a9d0a4d3348cbb257828510313cfe1c8b59c185fe3
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 10292 bytes
SHA-256: 10fbb64e69e1481fd4793636ee18f908b176ade6a763516ead563eb6f8ca1d1e
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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