Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c5e7b3f73791af…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 18:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04bd3daecd5f000c0d15b527b6ffbfb6 SHA-1: fa9d1cdab729b568361c83835f819d38a5268320 SHA-256: 08c5e7b3f73791af9177d4bb31971aa03f3e8f8ef6dc4f928e99168d034a0d2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious files, likely disguised as downloads. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=harry+potter+android+game+free+download+apk PDF link annotation
    • http://sushrutproctology.org/ckfinder/userfiles/files/30072369540.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/zupuwi.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/67861251025.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3f83c6a9caf61183d4e6528920f5363b/51442429227.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bajuvaduru.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zepogoxadezozalenixuxo.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/24733198973.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gofevir.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/govezedu.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/seziwoxukitepinaxebev.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/29032911288.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210909092322_92g37t.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/32444278207.pdfIn PDF document text
    • http://onecre.com/images/content/files/nofikelasaxav.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911220632.pdfIn PDF document text
    • http://qdjshg.com/files/file/18333565987.pdfIn PDF document text
    • http://artio.pl/files/files/merogepubevefulijutabivu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/toxebijutanavife.pdfIn PDF document text
    • http://apsons.eu/files/file/21597808389.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/vowovidowelufagutudomak.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/62048400931.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b251fab4c2---90541264405.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/31989590321.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/3276516062.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nugok.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 10956 bytes
SHA-256: f606c02698ec256730a47cc80cd71d4e213bf60301e570848e1ecb1d77f904b2
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 19624 bytes
SHA-256: 6474243734ee3badde5307753e9fce0929d8727e1f268529aaf22b3d3f2b3c30