Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59a489eed8177e8…

MALICIOUS

PDF

84.3 KB Created: 2021-03-11 19:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2748b9143e8a63ecad90cf8910c454 SHA-1: dcb17d9da0a9614841cb2dbb7bbe6cc30e355ca6 SHA-256: d59a489eed8177e852360cd6ba46f0ef5d30625bd5e07a87eba9e35f40ab632d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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/wix?keyword=greely+high+school
    • http://mamontov-net.cc/dungeons_and_dragons_3.5_psionics_handbookl14fo.pdf
    • http://vizionsmc.net/how_to_get_small_knots_out_of_string8imrv.pdf
    • http://fezideruxojogo.iblogger.org/how_to_become_an_emergency_medicine_specialist.pdf
    • https://cdn.sqhk.co/jivazufevi/chajb6J/risuxefewumidibemadezazen.pdf
    • https://cdn.sqhk.co/tororukiwuri/ge6ghuy/60279517989.pdf
    • http://metarapuw.mypressonline.com/79993554004.pdf
    • http://yatvoyya.fun/bipolar_junction_transistor_experiment_reportq06w5.pdf
    • http://itravelimpressions.com/hi_tech_syrup_for_saleuffvx.pdf
    • http://siteznakomstv69.space/defemakesonufojesafobisjkl1.pdf
    • http://dakisemakegag.sportsontheweb.net/avatar_comics_imbalance_read_online.pdf
    • https://cdn.sqhk.co/mogezunir/a4WTAij/packers_game_schedule_today.pdf
    • http://fullpisetc.ru/10967347709d2rir.pdf
    • http://dobilarujokux.sportsontheweb.net/bitsat_2020_syllabus.pdf
    • http://trixy-matrix.space/how_long_is_dialectical_behavior_therapyrd0x6.pdf
    • http://shop-kid-toys.online/nipeketupa0ui1z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/acab8e97-9c6d-4dc6-9234-a381fbaae6db/38103363492.pdf
    • http://galusuvojames.epizy.com/maytag_bravos_dryer_wont_dry_clothes.pdf
    • https://uploads.strikinglycdn.com/files/169869e5-6f1f-4a72-8e68-ef82c0d487d2/247_poker_deuces_wild.pdf
    • https://uploads.strikinglycdn.com/files/c52ec73d-5f12-46e2-ac72-f393fc9db400/how_to_program_harbor_freight_jumbo_universal_remote.pdf
    • https://uploads.strikinglycdn.com/files/c42fc061-0829-4f27-ab76-efdd796bbea6/how_to_allow_flash_on_chrome_android.pdf
    • http://nowapuporab.epizy.com/videosecu_ml531be_tv_wall_mount_installation_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e941f2c2-2736-4c49-b471-02f7386453fc/nafakejisugugedaxosenomaw.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_off00010ea9.bin
8ef72f9f20e0a3b0ca2b8b1ed9e8c18d98a20b9154a632fd8309745241f567c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 4984 bytes
font_01_sfnt_off00011faa.bin
d13dba7adb107205de531bc2e7678abfa149b7e50c7b6eb94dc045761dec030f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10624 bytes

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