Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b453b90f7a1c6…

MALICIOUS

PDF

70.4 KB Created: 2021-02-28 19:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0a150ac5601b2dd7892383341b32a78a SHA-1: cff140334fdc54f33aaf41a50e944054c21719b1 SHA-256: 628b453b90f7a1c699e7d4cade4c253f8121b0a32ccd2f1d5da903fb68e8f5fb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://kuzutuzo.ru/award?keyword=teacher+created+resources+inc+answers+the+giver PDF link annotation
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/4621761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5feecb915522c.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/nakuwebunagidevebew.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/Rgjbdty/the_office_parkour_meme_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/Xicgcgc/tisebizoxuserirolelumi.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/3QggjhC/78724825907.pdfIn PDF document text
    • http://infonewsuk.site/giraropelatixikapaoqcom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601e38a4011fc.pdfIn PDF document text
    • http://bnl-jobs.com/orhan_pamuk_about_istanbulphyjd.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/knee_osteoarthritis_treatment_guidelineaxfo8.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/pogolo/lost_wax_casting_process_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/21404250602.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/panchatantra_kathalu_in_telugu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/is_steak_good_on_george_foreman_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/attack_on_titan_episode_guide_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/crystal_growing_kit_instructions_science_mad.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 5268 bytes
SHA-256: 4a28ea68981912885f4176d8f5e34b92455b788eb6bb9b722cac72e4b02c858b
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 10128 bytes
SHA-256: bb887dcbc2b098a209c1b2da1a697b91fd6333bf13b1339cdc28d7bad7c79107