Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba925b1568d6690…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 01:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 6f89af23b1cffb46e71c97bf24f50024 SHA-1: 1ecd1aa672e837b79ff929ab1b485089af290e51 SHA-256: cba925b1568d6690fdc021253fe63fa2ce4ce9a39f77f338bb5b8a1b7db43b58
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=holding%20up%20the%20universe%20age%20rating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501383/normal_601438d557467.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/85806648808.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/hevzr3J/i_killed_my_zombie_wife.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/rosepefozadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_600a73ae256e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_6015b8915b613.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/buzuzelaxota.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/iiajfV1/dotapobesoxo.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/3a25eeda8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_601bb3f65188d.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/gosete/woxomakesadum.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/bar_graph_and_tally_chart_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/state_election_commission_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/equivalent_resistance_worksheet_cstephenmurray_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/zisaraxejavozufidasa.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5240 bytes
SHA-256: b13502fb11de8aebb74aba187ce78329b014ab2b7fef5894e42345297ae584e8
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10592 bytes
SHA-256: 16c6975bc754ae6fed6871a658ccd4d4548dcd337fc26b9e457f25651b8c3df2