Malicious PDF — malware analysis report

Static analysis result for SHA-256 5766b011025bf38d…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 09:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08e05913abed2b415e74dd3a318e3c85 SHA-1: 9dedc70c8b7c7d41ed4de7b15d923a89206cd1ac SHA-256: 5766b011025bf38df6093a7e30e5a58e115f7b5c308808543c365fb34d105455
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=diffusion+pressure+deficit+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457296/normal_600a5ed3b77eb.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/O1AjhMU/portal_knights_switch_multiplayer_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ZhjegiV/gapudak.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/jeyeZjc/hill_climb_racing_best_vehicle_for_neon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_603cef60c1e0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453338/normal_60084ec46afba.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/qkbQhht/texas_longhorns_women_s_basketball_recruiting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_605f63cc4fd99.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/Iiihgib/free_roam_open_world_games_ps4.pdfIn PDF document text
    • http://wordsidepost.top/4000995714pqx8k.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/zuzedape-pirot.pdfIn PDF document text
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/661032e0.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/gevhhlP/history_of_islam_audio.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/nuzamade.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/8jf5G4k/airline_commander_a_real_flight_experience_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_604a9da7189d2.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/dighd6M/skull_wallpapers_1080p_free_download.pdfIn PDF document text
    • http://istra-backwater.ru/cavernous_malformation_of_the_brainstem0yyh1.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/OM3Oha6/xetajezulaboputajoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1c3cfb-e12d-4e92-853d-8bd847890e17/5912089848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d21456b-1ae9-41dc-b04f-db2e63280522/petuvagejikubakevupum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfc3bfb-fb07-465c-a82f-cb79fc96f404/70331592865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ebeebb-a791-44bf-ad43-f08b2d3f1e89/how_many_polar_bears_are_left_in_the_world_in_2020.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 5208 bytes
SHA-256: bc0047959e0dca9bb5979b1ae8063c7fcff341033072f8178594b3561a3b7881
font_01_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 10276 bytes
SHA-256: a41eb9c42dad0c026636ac48ef7febeca249204ad59af061b5b420d5d262e212