Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15c6a5e3f1707dd…

MALICIOUS

PDF

85.9 KB Created: 2021-04-02 14:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 657c1d054a9fcd3c1a948e479570b4a0 SHA-1: 36758c01950f04975e714dbcfa0072b98d4058b5 SHA-256: f15c6a5e3f1707dd068e5cc944c3c7bb356bbc51e90b69c39f7a4f12df8e716c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic or suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI findings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/award?keyword=general+biology+1+pdf+grade+12
    • https://cdn.sqhk.co/wojusipi/jaSjaCt/xilovi.pdf
    • https://cdn.sqhk.co/tutabudoxuwa/hjvBhcb/lesabuvogojagor.pdf
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/3412119.pdf
    • https://cdn.sqhk.co/siboxowimu/hddgeic/carson_city_weather_yearly.pdf
    • https://cdn.sqhk.co/manigonodapu/DCkiiaV/93049999816.pdf
    • https://cdn.sqhk.co/geruvijiwiw/zAYNgho/carnival_games_nintendo_switch.pdf
    • http://kidiwutimako.mygamesonline.org/vifatufusepafite.pdf
    • https://cdn.sqhk.co/sugefixa/EijBXwa/rambo_pony_fly_sheet.pdf
    • https://cdn.sqhk.co/kufejagefep/dS7Dyih/oldies_music_70s_80s_90s.pdf
    • https://cdn.sqhk.co/pulovafafita/jjzjjAR/wallpaper_snake_io_worm_zone_2020_mod.pdf
    • https://cdn.sqhk.co/mugukawi/jsBSijL/dupotovosiparasove.pdf
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/6252127.pdf
    • http://xuxikurov.mygamesonline.org/benchwork_and_fitting.pdf
    • http://ligugiban.scienceontheweb.net/wasexuzusaxitu.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusori/how_do_you_refill_primo_water_at_walmart.pdf
    • http://nejimafalun.onlinewebshop.net/how_do_you_charge_a_ego_t_vape_pen.pdf
    • https://uploads.strikinglycdn.com/files/191ceffc-e646-4e35-acfe-d0d41ad3ca4c/tavepizujosegisibelop.pdf
    • https://uploads.strikinglycdn.com/files/71a20647-1e1f-46cd-b1b7-169adb156d63/what_does_a_vp_of_client_services_do.pdf
    • https://s3.amazonaws.com/fofeguj/vozatuduliv.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_off000106a8.bin
cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 1872 bytes
font_01_sfnt_off00010f9c.bin
7a7300c3c21f4254e224ed7d7a7206e946f18ebcffc21e2499c1a9a3603d961d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 5488 bytes
font_02_sfnt_off00012262.bin
1fd2a3e3e5f22e55e1cd729ee9049c6d9f452caecd89e3f6453a4f119b236246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 11616 bytes

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