Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8104d3873c5ed36…

MALICIOUS

PDF

72.4 KB Created: 2021-02-25 21:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 00b6cdbe3128c3ceb0c791803e25211e SHA-1: 9477e4dd6dadd218a5b537519c86c2b987d3f575 SHA-256: c8104d3873c5ed3632ba1bc98ec2cd5cb2883797fcc487ea65eb2d324d330a4f
196 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
  • 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.
  • 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.
  • 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://jacksth.ru/award?keyword=what+does+a+dental+office+manager+do PDF link annotation
    • http://lumobumekola.getenjoyment.net/43266846297.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/Dib9wYd/roll_up_vs_fold_up_bed_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/8zgt5hh/easy_medium_and_hard_riddles_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/kif1nhj/nukukunanikipak.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/kukolobapamoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/gfLAhe3/34643583314.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/oPjjzij/civil_war_battlefield_franklin_tn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_60040a73cd482.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/what_gun_companies_does_beretta_own.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tapexiw/20661810871.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/rubev.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/fun_vocal_warm_ups_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/street_fighter_4_apk_plus_data.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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 5448 bytes
SHA-256: d75facbed326e76fc0d93e287b17000a8e5432a43029e1bc97e7465eb2a693ce
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 10784 bytes
SHA-256: d2cbefe9f5286cdad5e4604909ead127af571ae36e3a059bc86b592a270d7cae