Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54b909828c5a26…

MALICIOUS

PDF

67.8 KB Created: 2021-03-23 21:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6780a189405aa86c78071f2a6102e2 SHA-1: 94cda3516e79384368c808c11ea8f0ed971e0456 SHA-256: ee54b909828c5a26b5f494644a355bb78972a132a8cfde8b41fa8aa3a42bced0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be related to 'ecosystem matching worksheet answers', a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=ecosystem+matching+worksheet+answers
    • http://kolagozisil.mywebcommunity.org/72646142024.pdf
    • https://cdn-cms.f-static.net/uploads/4379859/normal_60303e8f53e4c.pdf
    • http://kaxiwemusemoj.mypressonline.com/stock_trading_for_beginners_india.pdf
    • http://leziwazedo.mypressonline.com/jorevikonobupokiduw.pdf
    • http://lejunuzegakikuv.mypressonline.com/wijigogenev.pdf
    • http://xuzerujagojagip.scienceontheweb.net/automatisme_programmable_industriel.pdf
    • http://vajukadezazi.getenjoyment.net/accel_world_light_novel_volume_5.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_604b352c610f6.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_604afc4fb73c3.pdf
    • http://dadivasim.sportsontheweb.net/active_and_passive_transport_in_cell_membrane.pdf
    • https://cdn-cms.f-static.net/uploads/4495526/normal_603f1c0697eec.pdf
    • http://koponegigat.medianewsonline.com/yaesu_ft-2900r_operating_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/32ffb1b0-9739-46d5-b37c-fd07e8e0f9c9/86912732533.pdf
    • http://diwavubodinaroj.myartsonline.com/best_smart_board_for_classroom_in_india.pdf
    • http://leparitupoxow.onlinewebshop.net/2704343381.pdf
    • http://vajapojaperusu.myartsonline.com/jam_classic_speaker_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0b7d711b-ef93-4dc4-92d9-c71d3f9a2857/59302051875.pdf
    • http://zesugipove.onlinewebshop.net/how_much_does_a_gas_furnace_cost_to_install.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_off0000ce06.bin
57a3842a9a3593cbfa76f4849f472427cade0ee25e2905f9d239bbfee5f408fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 5396 bytes
font_01_sfnt_off0000e051.bin
6afe26a14205fdad1afa09c5c192fb33b1039d729a4518095562702b2a2341ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 9904 bytes

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