Malicious PDF — malware analysis report

Static analysis result for SHA-256 043571d95bca0e25…

MALICIOUS

PDF

107.7 KB Created: 2021-04-18 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6708a0d4475d9a5da3eb840498773a54 SHA-1: 2032a1ff3e58ce1b27467c407542d8641e21972b SHA-256: 043571d95bca0e25c800874f151e1295b393d1ab9181bb7b61b5acbe505f3d2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+much+auto+mechanic+make PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491671/normal_5fdb193bb94c9.pdfIn PDF document text
    • http://jupomolitage.22web.org/maroregagukixak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc6a5844b28c.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/eYvijii/tojosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6025fe2deb64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_6064ba665a69c.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/9icgcij/kamujarububomoditaw.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/jijihsB/the_walking_dead_ps4_2019_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/egcBhbO/6296013396.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://sepudigarij.epizy.com/25662516501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc7f19d-e291-4e1e-99d1-1efbafcaaef4/2008_buick_enclave_cxl_for_sale_by_owner.pdfIn PDF document text
    • http://getetir.epizy.com/58450594289.pdfIn PDF document text
    • http://gegumapobok.rf.gd/canon_60d_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/63910202477.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/car_racer_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749ebfed-236e-46b2-a138-409ebbae7ff2/26200171464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2733a01-fdf4-44e2-a545-8bbb24170418/98073972988.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/movonaginozuxalijovenu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/muwiba.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/how_arbitrary_waveform_generator_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899e5ad7-d8ad-4b25-8859-e13c8d763ba5/what_type_of_formula_does_wic_provide_in_nc.pdfIn PDF document text
    • http://velumosak.epizy.com/32177760063.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_off00015b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1F 4732 bytes
SHA-256: 70fdbb2f0bc72ceda2a221803a43f7d691692f254a9bc2c0add3cf990745e0fe
font_01_sfnt_off00016b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1D 11756 bytes
SHA-256: 9df7d0486cf854f2d848b2fdf3827d2c4f2f350373b852e69efc758268595688
font_02_sfnt_off000192c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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