Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf48832b8de38599…

MALICIOUS

PDF

90.9 KB Created: 2021-03-13 16:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 346a806956c66cb6790346e8e71a05fd SHA-1: d428bb04b08cfef94c9181d2d3e7762bd3e35748 SHA-256: bf48832b8de38599fe1c671fa1f4a0a3de28c5c48ab96d93648d2efba9863dde
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=quiroga+almohadon+de+plumas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5fcc2f13a75a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_6007457d60449.pdfIn PDF document text
    • http://metazoaapc.fun/buvaxivevetezeverrexr.pdfIn PDF document text
    • http://1xbets-reg.site/73524590028ckjde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fce54c3a286b.pdfIn PDF document text
    • http://1cats.space/snow_white_and_the_huntsman_trailer_deutschz8wmr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fe81e139ee1b.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/xukonakefules/faculty_interview_questions_and_answers.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_aa54ba40682f47f2b2b0bc78bcef9c6b.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_28fd232ea562471f9b86b08e9cd6af0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/the_wisdom_of_crowds_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb1115c-3284-4030-8020-b2a80a4e3b52/51678066436.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/trust_antisocial_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6784579-27ea-4a7d-8db9-c10acb794cd7/how_to_remove_grease_from_drip_pans.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/noco_genius_g1100_not_working.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_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 5516 bytes
SHA-256: c9f83e9d4ca4054ae1e6f12ab841df4a3db319de8a1d547d10158160690189d3
font_01_sfnt_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 12164 bytes
SHA-256: 26fe9b5258bb479f14af2889dc2aeea7f143bfab69db58740ce7a26515e1b4d6

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