Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5a6f1f3cbee74…

MALICIOUS

PDF

72.7 KB Created: 2021-02-06 06:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 5acfd8f51bd7eef612de3dfb283274a3 SHA-1: ff2e0db9bbad854c0036ef2953d8afc1d3081ba9 SHA-256: f8b5a6f1f3cbee74cc5c893f6d9df3c1c4081955ab8f6f8f87713bf70342a372
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=beers%20criteria%20pdf In PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/sasezibotoja-zufabajejaku-nusifewinara.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/qjcvxFc/deadly_medieval_arena.pdfIn PDF document text
    • http://umniashka.ru/vuzimofufezusegabagas35c0w.pdfIn PDF document text
    • http://leomannapov.com/752660899764btgq.pdfIn PDF document text
    • http://golosa-spasibo.ru/ice_cream_waffle_cone_maker_machinekppws.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/jgDzHhi/butipopilerefipi.pdfIn PDF document text
    • http://7lessons.website/mekevemezftxz0.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/soxen_ridifukova.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/jhgSFW7/big_head_soccer_championship_weebly.pdfIn PDF document text
    • http://bnatural.space/hanuman_stotra_in_sanskritao6wx.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dmvighf/meme_soundboard_for_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hd4eSsM/xuxuvune.pdfIn PDF document text
    • http://medgaj.com/fun_home_alison_bechdel_barnes_and_noble89qxt.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/72122cc7c.pdfIn PDF document text
    • http://hookup157.site/xetexuwuwilibidig1fsj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5164 bytes
SHA-256: d6a3c82f89437d718ecd0505687cef7b3027d14ea75c945fbe54774ffbc03607
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 11988 bytes
SHA-256: b8201f5e74eedeaf2d653a284ce192e214c9a795101237539e227cc5f62194fc

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