Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77b6f4e063ce1f6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 18:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c63ec85631174c61ae40beead9838e3b SHA-1: 22b6b0533b84641bdd6c3ffa7b6338056ad6df4f SHA-256: f77b6f4e063ce1f69a8728db7969bc70f4b3bb88ba337a3bacffb90c883becb0
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=fan+of+guns+mod+menu+apk PDF link annotation
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/bumojasad.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/23115251066.pdfIn PDF document text
    • https://architektor.ru/uploads/file/vomuwa.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/43603751510.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/sopizuwofagarelufifedebe.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/57562350050.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/valegijiw.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/26017014063.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/37692922990.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/55081087669.pdfIn PDF document text
    • http://isvpro.com/custom/files/16232201593.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/60674512767.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/mutogosixovokitabimiki.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfb3e18ca---luzupijipajibivuvazupiwim.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/52908857624.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/15011910972.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/wodigamovuxuv.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/4413336478.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/perokaturediwumewawipo.pdfIn PDF document text
    • https://ikima.fr/uploads/file/raxavipatijenejoxo.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/14682122149.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/4111643673.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/60915423438.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_off0000ae61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 10672 bytes
SHA-256: 19bd3b49bd57b954a91e35e6527b3fee4e17081e989cfdf3ea37c0396d768e5e
font_02_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 14628 bytes
SHA-256: 1e52bd1bd126e8cadd327e5d04b4b8048a3ebef97c22a799c32115a81998e6f7

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