Malicious PDF — malware analysis report

Static analysis result for SHA-256 450db55a1fadcb36…

MALICIOUS

PDF

71.1 KB Created: 2021-03-19 00:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21bd2b5fe836510ce3ca7af23756026 SHA-1: b8b362ae603f2daf0fa2593fb458940872ff2939 SHA-256: 450db55a1fadcb361c71eca7cb84adc35a659eff3c0bd811967091548b3f58a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains a large number of external links, many of which point to Weebly-hosted PDFs with numeric slugs, suggesting a link farm or SEO manipulation tactic. One embedded URI points to 'leonvi.ru', which is also suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=programming+in+ansi+c+ramkumar+pdf
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/voruritumujaz.pdf
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/b865a.pdf
    • http://meetsoda.club/givifaruk0m1ym.pdf
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/xedaduvu.pdf
    • https://cdn.sqhk.co/nobukomorur/pieQghR/vawomidetoxepig.pdf
    • http://pristav.pro/35929177690sn461.pdf
    • http://m-ryanaf.site/94257308496pm49t.pdf
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/be2de5a5e6ddaa0.pdf
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/lipubave_rinixesu_pajixijagavavol_zivuvugi.pdf
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/jajurife.pdf
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/dexala-jerisuvus-jebum.pdf
    • http://tehnikator.ru/the_late_great_planet_earth_downloadfrln3.pdf
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/sujod-fawefikavezokew.pdf
    • https://cdn.sqhk.co/tukawezezo/fgyjjR4/surviv._io_twitch_mobile.pdf
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/silovotezuze_dokulazeligaj.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/birapiluwixiru.pdf
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/wogufaxowitelaxobi.pdf
    • http://adr-media.work/juxunnuqwu.pdf
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/b9c93c8b70e45cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_002e54e676414f79addcabc1518b1082.pdf?index=true
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_4dbbe53fbeac49e7a0cea07438b86142.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4e011959d1354a3d995bf3c6d2446451.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_18ab603326fb44138111e62e5a001049.pdf?index=true
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_c7d6619458d14b32b6fc1892aca33fbe.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88b.bin
5fd759b343a936b9057143433599b712a6b2e82400335e526039c87ea71db31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 5508 bytes
font_01_sfnt_off0000eb38.bin
598cf335492d1d6c4f5e567ab0e9640517926e78f81315e11e9ecfd956b80b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10392 bytes

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