Malicious PDF — malware analysis report

Static analysis result for SHA-256 1155037be8cfc07a…

MALICIOUS

PDF

104.3 KB Created: 2021-02-26 21:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 34107efc9cde8f4d1a3058f3d9e35595 SHA-1: 08667302ba583f7b9498145ef99b65d415475fb4 SHA-256: 1155037be8cfc07a93ab7bfad7d6735dc28b29cc64025705f06b46fd6e4d8fa3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'infinity stones' and 'award', aligning with a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=what+are+the+different+color+infinity+stones PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/hcWAi6P/45989640966.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/AbhhigE/free_offline_world_atlas_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/pihiacw/27027135063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_5fea2137c3d93.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/htjghiW/hill_climb_racing_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/B0ibXEv/lanaxamifevutagozorave.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/jawbone_big_jambox_manual_resetktidx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5ffece3ab19aa.pdfIn PDF document text
    • http://sijowusim.22web.org/73261476268.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/ZFfSSgd/download_game_sniper_strike_shoot_killer_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/lovar.pdfIn PDF document text
    • http://pufaxutunipoja.epizy.com/jikusafulowezubalemabibe.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/archery_master_3d_mod_apk_andropalace.pdfIn PDF document text
    • http://folujas.epizy.com/20557588703.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/install_android_studio_linux_mint_18._3.pdfIn PDF document text
    • http://tewilojejesuj.epizy.com/vowulalibuvekopuvaza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E26 5224 bytes
SHA-256: bea59de979d6c5a593499579b629050c55a79b04f05e400b5bd1007f9ef3f665
font_01_sfnt_off00016ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFB 10364 bytes
SHA-256: 4b2bd27b560092ae5e0da32310fda4f92a761453d06eeaecd54982d348ce9c82

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