Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d8b8a7d088d0c3…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 06:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b0e50160f8eda188c15a1efae2e8df11 SHA-1: 1a39d0376543e114ece3747e73f819a6899bea3a SHA-256: a3d8b8a7d088d0c39caf3db928572e98b0b29e0d852a684fba4cb289abde540c
186 Risk Score

Malware Insights

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

This PDF contains numerous external links, a common tactic for link farms and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is designed to drive traffic to a network of external sites, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=parts+of+an+atom+worksheet+elementary PDF link annotation
    • https://cdn.sqhk.co/bipujawojeli/fshj2tb/8370457238.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/fogizizozanolunajuja.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/fOgikhh/t_rex_skull_3d_print.pdfIn PDF document text
    • http://busforpay.online/ajaya_rise_of_kalizkqk8.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/grimm_fairy_tales_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/1iaieic/bounce_tales_game_download_apkpure.pdfIn PDF document text
    • http://fredo.run/cashew_nut_nutritional_informationsog2s.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/FGrhevC/entrepreneurship_online_courses_stanford.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jbTp5gc/repost_instagram_pc_online.pdfIn PDF document text
    • http://bubble1.space/ratereposebojakul5dc7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/hgo7jbG/61635986699.pdfIn PDF document text
    • http://cuzinfo.ru/wopubomadegonidudrj3qe.pdfIn PDF document text
    • https://rolugoxeve.weebly.com/uploads/1/3/1/3/131380951/b8f4cc6.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/ohjiagh/mtg_tournament_rules.pdfIn PDF document text
    • http://nudistoff.club/bozodadwj92.pdfIn PDF document text
    • http://meriline.store/2002_buick_century_power_window_problemsqgxay.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ghgDgi8/business_analysis_courses_near_me.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/archicad_tutorial.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/84603081518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/77848604198.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_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 5268 bytes
SHA-256: dad3b823922a723e20eb85af0a34112d2c89fcc08e8626b73c8097807dfa936e
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10856 bytes
SHA-256: 572d4c7d6005c136ff83eb310860a1fd1613ef231e464d617d0ae9f835101e4a

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