Malicious PDF — malware analysis report

Static analysis result for SHA-256 978858cb24d879ed…

MALICIOUS

PDF

65.2 KB Created: 2021-02-18 04:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 10db81a471c6e2447a5f7c361a5d0bf6 SHA-1: 78a676053f1bf99ac34f6f21d8667c081aab0e46 SHA-256: 978858cb24d879ed3f5bab019350dc1fbc57e5cc940bbe0175b6ba24535de980
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://leonvi.ru/123?utm_term=nextbook+ares+11+screen+replacement PDF link annotation
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/1489814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386336/normal_6008999668ca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fcfb6faec7ab.pdfIn PDF document text
    • https://nopumalazaf.weebly.com/uploads/1/3/0/8/130813483/001aa58136b8.pdfIn PDF document text
    • http://pimuxiv.22web.org/ropopuraxukitabeka.pdfIn PDF document text
    • http://kobasobapina.22web.org/zurizije.pdfIn PDF document text
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/412679fcc.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/62808349277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_5ffbe72003a24.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/tofizo/64016365594.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/48133831205.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/29772178276.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/87333593310.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/hey_yaar_sun_yaari_teri_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/78165175283.pdfIn PDF document text
    • http://vaxuxosubize.epizy.com/fapoza.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/panchatantra_stories_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/segutaxiroduxojov.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_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 5372 bytes
SHA-256: a0b0f95da3e2efb7029e6efb0f509e17c628ebde51c491da7eb6f6a9920fffb9
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10260 bytes
SHA-256: b6d54fbf01c546e52e7461e3d3a00af4d039fc29e8097cfe1357df08031e333f

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