Malicious PDF — malware analysis report

Static analysis result for SHA-256 13817ece5d1307d9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 18:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2517529834686c4ebfb36ed94f5e2fd2 SHA-1: bd2f9bd90fdba85854d7efd08050170ea4491f1c SHA-256: 13817ece5d1307d9ecb613fd0df9993c1668b968b87eec974cf658ac43b9a9fc
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 ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to insurance agent formation. The presence of multiple external URIs indicates an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=formation+agent+general+axa+prevoyance+et+patrimoine
    • http://duxogesubuz.22web.org/51765262314.pdf
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fd6647e3b9e0.pdf
    • http://housefashion.ru/libro_las_recetas_de_sascha_fitness_descargar_gratistp8n5.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6054d8a12a56d.pdf
    • https://cdn.sqhk.co/jumunuji/gfhfjgh/bullet_bike_game_free.pdf
    • http://jobware.pro/intermediate_accounting_chapter_15x74la.pdf
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5fe429718d20f.pdf
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/e26680c9b8.pdf
    • https://cdn.sqhk.co/posebozej/heggcR4/63587706919.pdf
    • http://pek-24.cc/sesevesokomarasi0vaeh.pdf
    • https://cdn-cms.f-static.net/uploads/4446762/normal_6042835b3950d.pdf
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5fe0feb79f079.pdf
    • https://cdn.sqhk.co/giganopof/aRChfii/foosball_winner_game_board.pdf
    • http://rerazato.22web.org/ue_boom_speaker_prices.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/317029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_b17e0b1c73824bda8757576aa1d9c06c.pdf?index=true
    • http://kifilexaxinazer.epizy.com/70572627162.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_4fa0e15b21aa41c3b775f56fa4a3ddea.pdf?index=true
    • http://sikopenopod.epizy.com/golizavoperurutopijax.pdf
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_e74eb5a07ab24d76b24944182f7ceacb.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_c76ff12c2c5b4bf6b8b19b6af09e1eda.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97f.bin
37014a955508de9bafc8847324d95eaca8dea979b8cd0bbe8fb18965be7d85e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 5260 bytes
font_01_sfnt_off0000fb61.bin
37b9d7fd9e8358f750b1c455e6b73f86b3e658739f900a46d01d5680009a4a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 12540 bytes

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