Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2fe1f48f452b47…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b886f5e404d8b60adc16ccc26a7e9eb SHA-1: 67d4086a58a8976da3df288e891b2b4ae797daf1 SHA-256: 9a2fe1f48f452b4725b3c60a84cc2f2da01f0dcccb9415b321f3431e714bfff4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of disposable hosting for multiple links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=speaker+test+android+code PDF link annotation
    • http://bud-med.eu/userfiles/file/51505941610.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/gakoluzutironezolezub.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/20454236088.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/40636418523.pdfIn PDF document text
    • http://halkum.rs/files/totixowedijozobisilosasej.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/94287792622.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • http://stromzeleny.cz/file/medoxusekosubowifodi.pdfIn PDF document text
    • https://cristalensi.com/public/File/kelevebifologivob.pdfIn PDF document text
    • http://starma.pl/files/file/15227532654.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/xawiwasenuwexanasapen.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/64281490194.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/34033401948.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/40736893581.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149f1ae1f4d4---fowonutituborezuzuzifu.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/80412449594.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powigezabuxad.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/39068631.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/29004329534.pdfIn PDF document text
    • http://elskenecologie.nl/files/degekazikugokinapa.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/13508416154.pdfIn PDF document text
    • http://gzwep.com/img/file/202191205919.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_off0000acb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB8 10628 bytes
SHA-256: d5a4172df5a007ce04b29a4ad52dc06c6ac6a788a80319479578c9a195bf7580
font_01_sfnt_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16308 bytes
SHA-256: c84f942184e58659517c434ce6fbc9953b7faa545ce5d36645215103d194e7f7

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