Malicious PDF — malware analysis report

Static analysis result for SHA-256 6641961d0256eb62…

MALICIOUS

PDF

77.0 KB Created: 2021-04-17 17:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4ffcbea215e8438c45cfb4bcd36e6004 SHA-1: 518422b6eec2285698a6289c24a767c7974b1248 SHA-256: 6641961d0256eb626b4bae47cd42a8d1f789be082986a82cdcc0c630f5701ba8
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 0.9993

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
  • 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://dugedepap.ru/strik?utm_term=aqualink+rs4+manual PDF link annotation
    • http://dotavulilego.mypressonline.com/sizilapumujej.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/ehjoigh/33852507838.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/cyUjaoN/ey_private_equity_briefing_southeast_asia_2019.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/49278526126.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/caHbnjd/fireboy_and_watergirl_games_online_free_gahe.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/jubone.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/dQY2Ohd/wuzisumoxefu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/3NRhbgb/jakevafonevukiruxobod.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/how_to_adjust_sears_craftsman_garage_door_opener.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/26497592447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/arban_trumpet_method.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/dijulerekakovoxujusi.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/92706753138.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_e187087653264acb94634b2e00fc935c.pdf?index=trueIn PDF document text
    • http://zujakogi.onlinewebshop.net/calibration_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/ancients_paladin_5e_guide.pdfIn PDF document text
    • http://madulok.epizy.com/anuraga_devatha_songs_from_naasongs.pdfIn PDF document text
    • http://wumuduwowuwi.rf.gd/26044808671.pdfIn PDF document text
    • http://gukimag.rf.gd/rutekezupifoxogu.pdfIn PDF document text
    • http://wavaloseteto.epizy.com/dotnet_core_html_to.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/84685727321.pdfIn PDF document text
    • http://derazikabulode.epizy.com/carry_on_livro_download.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_fae0385bef164e7a979e6c60e0f5b871.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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 5100 bytes
SHA-256: 4e33619148d56907856891052e24f0d7baa6d0bd3e21e14cb34897d1c69902de
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10852 bytes
SHA-256: 84f7633b52709b843ab147df1bb3a7bb40d0d10693aadd99c0dc30053a59fdb1

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