Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ca773e400f249a…

MALICIOUS

PDF

89.4 KB Created: 2021-02-22 11:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ac76300de42e146dd11547135a4dc68 SHA-1: 4e930796cd710514a4087495b3f0519b6719331c SHA-256: 98ca773e400f249a54ba4d259a91912469b9f9453af78b13672adf655553fdd0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics further supports the classification as a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=garmin+astro+320+manual+svenska PDF link annotation
    • http://store50off.info/753575965652g20o.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/d2jbMO0/bowmasters_download_for_windows_7.pdfIn PDF document text
    • http://exampl1214.com/75194082856mlv40.pdfIn PDF document text
    • http://hr-insider.com/8252063152256zfb.pdfIn PDF document text
    • http://cetapp.xyz/pisexekuzejosonegifekirlho9q.pdfIn PDF document text
    • http://covid-19online.site/chapters_interactive_stories_unlimited_diamonds_apkfhv7n.pdfIn PDF document text
    • http://taygerr.com/what_are_the_dramatic_conventions2yuy0.pdfIn PDF document text
    • http://look-hotel.com/388732286486ykn.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/gbatemp_noob_guide_wii_u_hackingw7qzx.pdfIn PDF document text
    • http://milanbeach.fun/arduino_esp8266_wifi_shield_datasheetpdbpm.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/jeTgiif/magic_cups_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/fvCjeha/solitaire_card_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/hfheVC3/switzerland_flag_image.pdfIn PDF document text
    • http://domsale.xyz/marketing_consulting_contract_template_freeq5z3q.pdfIn PDF document text
    • http://copyrighthelpcentral.com/central_mn_breastfeeding_coalitionktoha.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/napejaxosinages/abp_ananda_bengali_news.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/bodatetakopeperakew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 5424 bytes
SHA-256: 6b910134d68b52e2a3a353d83508bb21334e5f1221c201860bb92a901b195968
font_01_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 11972 bytes
SHA-256: b050c83b0cd0517bfbc8569f413eb45f1f755ca44e87dbafef2021544bf0c53d
font_02_sfnt_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 16176 bytes
SHA-256: 8e4d0e27ed28c7b9909780669248d52c2e2d3c038e843f7d141ed89db176cb58

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