Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c79d63ae757c62…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 14:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0cc885190cdbb385f9035375b3e21f3e SHA-1: 3f05a2c10e2443837e9f36c4f5360f08170a470f SHA-256: e8c79d63ae757c62dcb5eebf4210a8f9fc91dc6dedba5a3332196f25a9a33766
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_IMAGE_LURE' suggests a phishing tactic where a visual lure hides a clickable link. The ML classifier and ClamAV detection strongly support the malicious verdict. The embedded JavaScript likely serves to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=minecraft+apk+download+free+ios PDF link annotation
    • https://u-spot.biz/js/ckfinder/userfiles/files/50157888191.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/48704585571.pdfIn PDF document text
    • https://dalba.net/other_files/File/nikojelefazexinadosu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/dazev.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/parexakuto.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/24196826195.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80511142370.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/mibamadu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/2990387515.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/mituwizufesuvapelono.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/a6stkfkfn98r1r5kb4h947h60b/8295656697.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vemiwemude.pdfIn PDF document text
    • https://drlanda.hu/user/file/72580266354.pdfIn PDF document text
    • http://tai-group.com/upload/files/zatusunafimamufa.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/49998483704.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/lojefumeforavub.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/24339782321.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/34147418262.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613979eaf046b---zilipadobevopilozi.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/dezubixitimizowug.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60581871967.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/62005610320.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/rafobewebumexeredufogaw.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/xiputipifibav.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/pokegikuweboketiwebilo.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10784 bytes
SHA-256: d01b9515d945c60f35c70a019144a0db267329c1b9f3e64cd79dfa19aa4f32fa
font_02_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 14048 bytes
SHA-256: 3d842049bfff1cc811d1eb19e347bc7b6ffd6a1353cb83fa68fdee372aff16fd