Malicious PDF — malware analysis report

Static analysis result for SHA-256 11778721dd62a5a4…

MALICIOUS

PDF

77.7 KB Created: 2021-01-30 11:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3773eaf66691730a909dd8e58bfb570d SHA-1: 7654cd783276dda040d2e1bf1cc581159626f186 SHA-256: 11778721dd62a5a48d7bffbecc8223b1ff24b491ed7e6ac84e7cc2d16bcffba3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a lure to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafftec.ru/wb?keyword=among%20us%20free%20chromebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5fec5922067bc.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/hhAIKgU/graphic_design_software_for_beginners_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/gjji3hj/etude_house_face_mask_price.pdfIn PDF document text
    • http://xxlmature.site/hacking_game_app_android2vvt4.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/gagefijapejomexuwixuvujozii1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5ffa14dfca9d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/QjfRTha/game_screen_recorder_full_version_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/aWiahYU/61649590913.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/3ABoibP/wulejosedovomo.pdfIn PDF document text
    • http://newser.site/gatasawepdpks.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/f4tT0he/30510967766.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/hg3hdgg/mobile_soccer_league_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/jgIhgrr/environment_includes_everything_on_in_and_around.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/QjaWjfJ/dexuf.pdfIn PDF document text
    • http://copalofa.site/elite_motos_2_download_dinheiro_infinitooezu9.pdfIn PDF document text
    • http://yoptan.space/59672927170nd399.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/Blmqgh9/31225257822.pdfIn PDF document text
    • http://it50life.pro/sisters_hospital_covid_testing6pwl1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5fd805bc66ac2.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/bUVjaha/makosasuwox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_5fd615fb4c581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_5fc900edbf302.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jjhasjf/36358993885.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/gIhBEjg/46014520768.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5244 bytes
SHA-256: 0c63471d0d84e3afa0b93eb32dcabdac47d134f6f9a796dce7bdc8ef3d038241
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10472 bytes
SHA-256: afccdd0a594a84d97e3d88cb52243573face4186f29dc1ed855df5ab07b4b160

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