Malicious PDF — malware analysis report

Static analysis result for SHA-256 90547f9341bb1311…

MALICIOUS

PDF

78.3 KB Created: 2021-03-22 22:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66ceb439238ff23c2d903483315bf560 SHA-1: 2958668f41c6d435ab0f322b6f448206cc53698f SHA-256: 90547f9341bb131135f44a9f595de60a88bcb42d0c587354ce1533fa73b8c729
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://zajinet.ru/award?keyword=texas+durable+power+of+attorney+free+pdf PDF link annotation
    • http://itwow.info/47110195551gk4i5.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/FGjfigY/34809771737.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/mawefifopi.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/gjchhci/rajatogonubufug.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/hgjgAGi/21396220259.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/gc1Siho/riwamawasetufilimemu.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/bPjcheO/kebenoku.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/bhj6tge/heroes_legend_of_the_battle_disks_episode_10.pdfIn PDF document text
    • http://fapokopo.22web.org/different_types_of_addressing_modes_in_computer_architecture.pdfIn PDF document text
    • http://vugijow.iblogger.org/nukinaf.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/YrjjgdB/pixel_blood_online_god_mod.pdfIn PDF document text
    • http://creditreportfast.info/62608944537m917v.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/44hd5gh/sputnik_v_stock_name.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/igifgg9/kindle_app_android_show_page_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/jdptKgd/naxeex_superhero_mod_apk_unlimited_everything.pdfIn PDF document text
    • http://titanof-filtr.ru/kisimatovogz8399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://javisan.epizy.com/27588935141.pdfIn PDF document text
    • http://noderukun.epizy.com/sownictwo_dom_angielski_wiczenia.pdfIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/pulevivesugereleven.pdfIn PDF document text
    • http://gajopule.myartsonline.com/63039700295.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5220 bytes
SHA-256: 9ad76eba54008085d6100d7e83ee911d27e89bb82e63d2ca26b96e7e7bcced0a
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10668 bytes
SHA-256: 7926884e0375141668d55ebd64fde30a3a335e9f541ac3647cc643ebb18ed5ce
font_02_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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