Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3124414581c5f3d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 13:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bfde462bd27f9ce7701885caab89e4ad SHA-1: 0a116533a61fbb97afbd52e2684c315bfbcad238 SHA-256: c3124414581c5f3d70edade25fe6b4224fcfd08185e4082289bac45c2047d300
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('jacksth.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/wix?keyword=derivative+using+power+rule+worksheets PDF link annotation
    • https://cdn.sqhk.co/gozigawefo/ihgcrjf/29072524714.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/hgIgh6J/55576149980.pdfIn PDF document text
    • http://flylovel.com/16205260512des83.pdfIn PDF document text
    • http://creamwalls.space/niv_audio_bible_download_old_testamentsdhfk.pdfIn PDF document text
    • http://drenajkrasnodar.ru/bareminerals_barepro_performance_wear_liquid_foundation_shadescogyd.pdfIn PDF document text
    • http://jobauthor.online/42761392548h0ow0.pdfIn PDF document text
    • http://helpverifybadges.com/34169344846lbmix.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/ArOiay2/taxutakifepebajojov.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/jggdvic/office_space_bosses_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/wrgcih1/rololiwejefuvoralepuwewo.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/hjeP6c0/62311641034.pdfIn PDF document text
    • http://loveantravel.xyz/53130931050zauoz.pdfIn PDF document text
    • http://creditscorefix.info/81377935787gkvoc.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.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/fadadedezeker/6595141472.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/hotel_preventive_maintenance_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/sovurerajubapenelowixaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13aa2fa-3674-4dfc-88ec-f40c125a9ab3/foluwomekatisesupusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2221e6b1-7dd9-4259-a23a-7edabf6c7fd4/46634857121.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/bed_sheet_sizes_ikea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cabad70-fb9d-46c3-a129-dcdc5a13e022/71569211338.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/private_limited_company_rubber_stamp_format_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ad974a-379b-461f-abf2-76edb5187ff9/39814955129.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_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 5296 bytes
SHA-256: 62d578eb22fd7f678deaee3062f5dc523dfe714901de74810e00752af02d9417
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 11708 bytes
SHA-256: 6d831565d4a55ffc21655162d8cf42de208c6f451df4b9842887392970e181e9

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