Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aa5cc5cb5f816f…

MALICIOUS

PDF

71.8 KB Created: 2021-02-08 00:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4c7f57b35efcc7456480b057275864c SHA-1: 68fba069629b8feed848c18ee58dde6f7fead70b SHA-256: 26aa5cc5cb5f816fed39324a85a6c951e231403e3ed6afad9c24e7a2348450be
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or malware distribution, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wb?keyword=chicco%20next%20to%20me%20crib%20sheet PDF link annotation
    • https://cdn.sqhk.co/xovikojux/Ogghjij/92989226714.pdfIn PDF document text
    • http://agent-spv.space/63760675742kyv62.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/sgcjijd/inferno_galaxy_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ihAFmNR/mozulitabixo.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/31777048634qa48h.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/nuxit.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/ghjhMhb/lego_hidden_side_paranormal_intercept_bus_3000_amazon.pdfIn PDF document text
    • http://ighelperscenter.com/pf_non_employment_certificatel9isz.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/dc4zkDh/mame4droid_0._139_u1_bios_pack.pdfIn PDF document text
    • http://goloszauniver.fun/jifupilusibutixonodoxes40gq9.pdfIn PDF document text
    • http://meriline.store/telehealth_services_definedukz8h.pdfIn PDF document text
    • http://usejus.pro/simplifying_radicals_worksheet_word_documentbiz72.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/hyehfGT/live_stream_nfl_games_online.pdfIn PDF document text
    • http://comp-arenda.site/gotamabusaz6oh10.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/ibideMT/bike_rider_games_best_bike_race_game_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/56hjzib/8559649834.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/hitxWhf/zowejaridewumasad.pdfIn PDF document text
    • http://national-verifyteam.com/898217848195djr2.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/C6Ngfgc/nes_100_games_in_1_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/U8wRv8s/alienware_monitor_aw2518hf_unboxing.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/hC4gdih/nijofuduxil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 4912 bytes
SHA-256: 4e5ea6b03b0162942f176e84dd3df998c28fa0aa12aad9cdd2307085194e12f4
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 11484 bytes
SHA-256: 59df244f5de700d62dedfcd8e3cdc4e1a524bd86039facf62c8a27f21156a796

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