Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb56bc28cf618e3…

MALICIOUS

PDF

77.7 KB Created: 2021-04-10 22:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 514811f4f70bc3482dc80f88a981edd9 SHA-1: 306e8b3074e59a6a9400f3f36625ff7e7376177f SHA-256: 1cb56bc28cf618e333a4d99e12679c9fccaa7dbc7f2396c2bc46fa36ab099cb6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=tris+die+in+allegiant
    • https://cdn.sqhk.co/gitogozune/geEWdcL/stretchy_slime_satisfying_slime_simulator_asmr.pdf
    • https://cdn.sqhk.co/pugudanirav/dggjKc7/98660287280.pdf
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/fefitigir.pdf
    • http://tujodugugejime.22web.org/cracked_games_online.pdf
    • https://cdn.sqhk.co/gixelotopa/fjgM2jh/40502801369.pdf
    • http://gifudevuf.iblogger.org/logitech_slim_folio_pro_ipad_case_with_wireless_bluetooth_keyboard_ipad_pro_11.pdf
    • http://befelofote.iblogger.org/39905773878.pdf
    • https://cdn-cms.f-static.net/uploads/4466165/normal_606496b4db767.pdf
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6026fa234dd83.pdf
    • http://xoriruviridov.22web.org/monster_hunter_movie_music.pdf
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/2b22ee38d8.pdf
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/d6a4f72b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f9f81cd-a674-4d70-873c-356569c059c7/digawirawidogemugurelip.pdf
    • https://uploads.strikinglycdn.com/files/4696a28b-a5dc-458a-8d3f-ae72f5e2ab1b/jamivisinexere.pdf
    • http://xaguxebijop.epizy.com/97072488899.pdf
    • http://romipozaxijida.rf.gd/buzodifidukabe.pdf
    • http://wuluminibopa.rf.gd/98630805386.pdf
    • https://uploads.strikinglycdn.com/files/2e3f9304-6cb1-4635-b894-663342f0c9c1/46852660004.pdf
    • http://tumejatamivalu.rf.gd/base64_decode_to_java.pdf
    • https://uploads.strikinglycdn.com/files/90bd4b7c-b688-42a6-949b-d83d438ad12d/92766577018.pdf
    • http://tilixufevoj.epizy.com/chaita_ki_chaitwal_song_audio.pdf
    • https://uploads.strikinglycdn.com/files/ef7d68a0-77dc-452e-a1ff-3066e2bbddc8/63523818919.pdf
    • 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_off0000f176.bin
9a19cd16c6e2b732292be09409989f2d2d7e9226afbb1340753c1fd7c107c88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 4944 bytes
font_01_sfnt_off00010252.bin
9167de322effb9670889b49865514bf4b9145a7edb775e56ebfed0033f26d9b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 11028 bytes

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