Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4b451d2f815da2…

MALICIOUS

PDF

62.2 KB Created: 2021-09-30 17:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 534b5edc4a637a50130e20c8203b5a96 SHA-1: cde6b0b757de7668969fafe9e412f059cedd0700 SHA-256: af4b451d2f815da20ab738efc4daff0b643169b754d968f9aebc0bcf628c1047
144 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with a clickable action, designed to trick users. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=918kiss+html5+download+apk', suggest a redirection to potentially malicious content or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5307

Heuristics 5

  • 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 62 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=918kiss+html5+download+apk PDF link annotation
    • http://leaders-adv.net/userfiles/file/32793275930.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/sosopexewovudakudera.pdfIn PDF document text
    • http://freeorden.com/media/file/metajumuzuvepop.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fatulozeniwazidodetiva.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210916235459_886298877.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/vurukudamabopulevezav.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/80307766482.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614890eed7300---62184001272.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec8dd3674fd471e8b294a4ad3c95eb2a/fitejepuzuwibo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/87598935043.pdfIn PDF document text
    • http://fpole.ru/sadm_files/47969791516.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/bogijesireledimegeni.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/52407371956.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/41776755852.pdfIn PDF document text
    • http://bociany.sk/media/file/moleb.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/refipepotip.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/99362143123.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rufem.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/84120697745.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/volelulalu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/78848304251.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/70240407285.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vadinesapo.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/duwaxufevugujoxaj.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/70484383122.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 11068 bytes
SHA-256: 81dca1a9407d273c89c975335c737b288cda9315f8574b1ab9eb436a4a8b7bbe

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