Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ece43fa8e714dd6…

MALICIOUS

PDF

101.0 KB Created: 2021-04-03 00:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e13bdae44d7bd85a27407cab162215 SHA-1: b670c3dc958534e83f9d2685d6f0adbe74bdb819 SHA-256: 2ece43fa8e714dd66ea1092b52b294f0d3214067f5f4e64a8f11a9a7ba3246f6
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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://jacksth.ru/award?keyword=examples+of+gram+positive+and+negative+bacteria+pdf
    • https://tenuwikenosex.weebly.com/uploads/1/3/6/0/136082269/jowen.pdf
    • http://tagoturuluro.medianewsonline.com/duxorusetofidelore.pdf
    • https://cdn.sqhk.co/jivazufevi/geijjf7/power_hover_apkpure.pdf
    • https://cdn.sqhk.co/sukexesi/Vgegfij/36508982896.pdf
    • http://mkr-olimp.info/apple_macbook_user_manualz3xnt.pdf
    • https://cdn.sqhk.co/savunowudob/iaYgfie/places_that_sell_retro_games_near_me.pdf
    • http://sowoxapexemex.sportsontheweb.net/edward_said_crisis_in_orientalism.pdf
    • http://vostokzapad.su/faruwopofezivuzidagaqya18.pdf
    • https://wixilasiniwib.weebly.com/uploads/1/3/1/1/131163505/3918434.pdf
    • http://finonit.mypressonline.com/who_has_a_dapple_grey_mare_patronus_in_harry_potter.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/fixuf.pdf
    • http://nasporte1.fun/bekilebepipasancoj4.pdf
    • http://form-copyrightservices.com/2006_harley_davidson_sportster_1200_service_manual2q0hl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a115e2b-4be0-4cc5-a3a2-b8412ffa5bcc/memory_techniques_for_textbook.pdf
    • https://s3.amazonaws.com/lovomijelun/gozawavijulijemateje.pdf
    • https://uploads.strikinglycdn.com/files/064df409-521f-4cca-a40b-6ef2c65d2719/71025350135.pdf
    • https://s3.amazonaws.com/jarirotexab/36235294247.pdf
    • https://uploads.strikinglycdn.com/files/b060894c-8940-42e4-9ea8-5c31bb358341/nepaminixewokoxijol.pdf
    • https://uploads.strikinglycdn.com/files/9627049b-c36d-4dcc-b003-3e21ee74c2af/81425298522.pdf
    • https://s3.amazonaws.com/nazekisigiduz/dominio_cientifico_ser_bachiller_2017.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_off00014803.bin
9455005d7849f85b793650c5d1b953c954986e2edc1344caaf1193c2625da474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14803 5700 bytes
font_01_sfnt_off00015b5d.bin
1e713960d20a8dbd2bdd671b7c77138fba28be514854744bbdb2c1d6fd29c06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 11924 bytes

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