Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc63eaf4dd372c8d…

MALICIOUS

PDF

73.7 KB Created: 2021-10-02 21:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab887bab58e153dab2aedb4839a17220 SHA-1: 7d16d733dd98caf8a306bbae3a9337885e350022 SHA-256: fc63eaf4dd372c8d93401744316f04258ddfc67ae21b17abeaa24d715f1ebab1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=best+website+to+download+paid+books+for+free PDF link annotation
    • http://skpizzasubs.com/uploads/files/gixiril.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/2635856032.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bbd20e0d20939f92191c4e6980912c0a/zirixa.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zawekuw.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kigifijemenerizu.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/ninabisima.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66250441539.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nedutove.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/32698089041.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/85614008699.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630852782.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/51598912855.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/xanedugaduribewuvibate.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/vosawekigomodoxawakide.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/39095016430.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/32247209492.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/siwuvatobe.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/zoguxu.pdfIn PDF document text
    • https://clickbox.ro/images/file/7248716043.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lijofudekalagi.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/mizuxinoxobonerelopi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/12138708793.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/ziwuloruranawagijotu.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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 10864 bytes
SHA-256: 607c8645bac8fe1623c6b508cfd51ee25234969f81bb71e09de2ffd073f345e3
font_02_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 19196 bytes
SHA-256: a99fd5367d01b3c9275e173f9e3f63e96e084f15528c451e9d9efb249f15fd86