Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8a09d461f613e6…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 19:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f674b104bb4ff382668709b14b7ed43e SHA-1: 850b37d5f92488221860a5cc2d208ed55e628fb6 SHA-256: 8d8a09d461f613e6ed240520a223757b294548e79763f02fa361086178adaf15
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=what+can+you+do+with+a+degree+in+biochemistry+and+molecular+biology In PDF document text
    • https://cdn.sqhk.co/surodamiz/gepnijI/30657973463.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/RR5haB5/new_among_us_advice_runner_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/agche4a/crossy_road_free_coins_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff9b3168b628.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/jhMgiMd/ripapufinigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifijawubizomed.epizy.com/munujon.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/95333611396.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/definition_of_augmented_reality.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/lic_agent_confidential_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/96043413468.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/32612572673.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/91241896913.pdfIn PDF document text
    • http://dunizolosonon.rf.gd/electrolytic_dissociation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/chicken_invaders_4_2_player_free.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/cheer_up_violin_sheet_music.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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 5700 bytes
SHA-256: c86488786b76aaa451ea135ca7736eb1f668c398a4932f7858aa1e76b6d63d5c
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10628 bytes
SHA-256: 852d44e0420fe824b69d1e35cc949689cd88f268646b7442882cc9b2bf4eb24a