Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac638abb6cf73e3…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c89e672a54b6146b8409aa61da03ebc SHA-1: 15853fd59e9b033d55c80e6e5cde238b4b3ae1a5 SHA-256: 8ac638abb6cf73e312a1afa24f785a23d81950c5a94ccada54782e42da2ccd2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=american+assassin+book+review PDF link annotation
    • http://vitetiw.getenjoyment.net/adobe_printer_driver_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/jhfheii/70583367826.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/2020_bmw_x3_owners_manual.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/society_and_culture.pdfIn PDF document text
    • https://cdn.sqhk.co/famogidoje/igjiihc/citrix_workspace_app.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/hggwm8Z/ropalidisinolorevibusos.pdfIn PDF document text
    • http://criticcxck.space/80856636494ywt11.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/xikimagisuzidesofimi.pdfIn PDF document text
    • http://tasefuvakol.22web.org/kikikitipinazetezi.pdfIn PDF document text
    • http://daating19.site/ryobi_table_saw_stand_diylmhf7.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/H4fh9ih/40431056816.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/e52hjie/rescue_wings_hack.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/datijuzig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/71743109371.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/luzapafarabodovibomizes.pdfIn PDF document text
    • http://zolewari.rf.gd/73591568453.pdfIn PDF document text
    • http://vutitogox.epizy.com/grant_collier_net_worth.pdfIn PDF document text
    • http://dofusuzi.epizy.com/how_hot_do_dehydrators_get.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/gijubezimiwesiwulanu.pdfIn PDF document text
    • http://litorow.myartsonline.com/5552497982.pdfIn PDF document text
    • http://todifisafi.atwebpages.com/65878419671.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/c_alignment_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/denimonakud.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/blackmagic_atem_pro_4k.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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 5256 bytes
SHA-256: 147a8cd6fdef8e76180d920e57684c13e9a09781a27d1c47301c85ae5e7b9f57
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 11560 bytes
SHA-256: ad91fcdaa4ba6c8c0d50aaf7748e15df48a1195dd0273d13c6f55a3907361343

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