Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f4fb912b0a4cfa…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 15:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 593d808674dbb3a4f4f2ecfd422af079 SHA-1: 17209ba335f228f316d0be454f43a21170801155 SHA-256: f0f4fb912b0a4cfa0f0ae49704be2a4fdfbf167439b9e1c85279480242189e58
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with award-related keywords. The PDF structure and content, though heavily obfuscated, suggest it's designed to exploit user interaction with these links.

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://xajibur.ru/award?keyword=din+513+buttress+thread+pdf
    • http://bufo.online/240940466583d2lo.pdf
    • http://videohost.space/deluxe_ez_bow_maker_instructionsu04fa.pdf
    • https://cdn.sqhk.co/tamurikubol/h7ZAqjf/13660822912.pdf
    • http://bufo.online/brother_mfc_j4510dwechdg.pdf
    • https://cdn.sqhk.co/mimofeto/eVdE9HP/13345184085.pdf
    • http://obschee.xyz/suvevususemuf0ihw.pdf
    • https://cdn.sqhk.co/rexixugepir/hhblgeu/72208258981.pdf
    • https://cdn-cms.f-static.net/uploads/4407302/normal_6040daf8b1580.pdf
    • https://cdn-cms.f-static.net/uploads/4470029/normal_605077c55221a.pdf
    • https://cdn.sqhk.co/rutunidosaw/dghheJg/mech_arena_robot_showdown_review.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5fe81e5664c22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • http://liramovabo.epizy.com/48816379196.pdf
    • http://zerekigukazaja.epizy.com/80638412838.pdf
    • http://xadogugatu.epizy.com/inorganic_chemistry_notes_for_bsc_1st_year.pdf
    • http://rezazaje.epizy.com/your_name_english_dub_audio_track.pdf
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_cc40cc9bd0224544b41acd1c281ac4a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01d51f33-1b3e-47e6-90a6-0835d133deec/70383687527.pdf
    • https://uploads.strikinglycdn.com/files/3f122201-b356-4628-b458-b7497812ffb1/62272409673.pdf
    • https://uploads.strikinglycdn.com/files/a84c08d7-1e3b-45c6-aa94-79260439b548/guitar_chords_chart_for_beginners.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_4ebe2ecb31e54acebf10b12ad8ab8a44.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_fbbe9e5c74b647b6a25a9d6c365e71f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88422645-0e1c-41aa-b1a1-4feb0e10d2fd/tecknet_mechanical_keyboard_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d8.bin
104c79ce6dd3a190e7bf0edb4fbf11e71407890921f760163d523e5ce5e0d220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 5576 bytes
font_01_sfnt_off0000f9d0.bin
ddb5568394d574260c5aac68e55c1ece3b865ecbf9b68c02d827149bd7ee708a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10340 bytes
font_02_sfnt_off00011d15.bin
5da22109c1fba17011c849e065b2f3278334ccd609d6a9cfc06e7966f70e6d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 2228 bytes

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