Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf84a7ab8b9a780e…

MALICIOUS

PDF

84.5 KB Created: 2021-05-10 02:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08c8c366159b18e706ff6c3cb3360335 SHA-1: d5b33ff8864abc9e91dfa74b8a2009c0a3afd746 SHA-256: bf84a7ab8b9a780e9de6fc61380a0c302d0283dc1c3df7a4e5b1ab0a06f24f56
226 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to obscure malicious intent. The presence of multiple PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics, along with a critical ClamAV detection for Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. The document's structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/strik?utm_term=the+masque+of+the+red+death+setting PDF link annotation
    • https://cdn.sqhk.co/pevejotomoma/iyghDdF/bubble_bobble_hero_2_free_download_pc.pdfIn PDF document text
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/zebovodawamig.pdfIn PDF document text
    • http://dressnbuy.com/xilozonoxovaforoykq.pdfIn PDF document text
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/wevokip.pdfIn PDF document text
    • http://workbykoder.xyz/vikurepomufasoxubuwajeghlzzx.pdfIn PDF document text
    • https://pelazokud.weebly.com/uploads/1/3/0/7/130775509/derenugaj.pdfIn PDF document text
    • http://redpandarecycling.com/darkest_dungeon_party_composition_guide4b64r.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/4911875.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/human_respiratory_system_parts_and_functions.pdfIn PDF document text
    • http://lnstagram-support.live/how_much_does_an_air_force_jag_officer_make6v8f0.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/jbE9ujd/transmission_fluid_change_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijesawojate.epizy.com/gexukimezedov.pdfIn PDF document text
    • http://jeputujakajaj.epizy.com/rozimuwijemeb.pdfIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/49842255517.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_59bd8aa4633744779866b807ca8fa6d2.pdf?index=trueIn PDF document text
    • http://walagezumeg.epizy.com/adobe_animate_cc_mac.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_ae8bf01757984ebfa17fdcc765f579f0.pdf?index=trueIn PDF document text
    • http://xinadapobeloj.rf.gd/biozone_year_12_answers.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/80071667773.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/seledotarufasajos.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_c61ddd430bff436c9cf3316e929a8bb4.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_3c13ad47a5e54fc2a78ff4c353cd6adc.pdf?index=trueIn 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_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 5364 bytes
SHA-256: 19831fa20222dceb14a5f1b36094ee1aa0430f8c46f75f2e3132537515784d64
font_01_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 10580 bytes
SHA-256: a3d69caed57a6b7d11a1da8908df08c9d9394add9d40c4ed2ec52305b46f8893

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