Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4853bb8eefaedb5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 21:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 819a041e3d93197dfec7452ca5692b5b SHA-1: bc0c9c23d1621e55240a28e88fb88ceb2bdf0557 SHA-256: f4853bb8eefaedb564b6a90bf3a95b041975394daf6e69e9cb495f1308ae53aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure by multiple heuristics. It presents as an image-only document, a common tactic to disguise malicious content. The embedded JavaScript and numerous external URLs suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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://drafthe.ru/uplcv?utm_term=vidmate+free+download+apk+for+android PDF link annotation
    • http://phuketdriveschool.com/userfiles/file/86664026252.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/15459802172.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/rutosavuvizileneninag.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/78021027520.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fa45b919d19672c05929a09b4ced0164/molakefob.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kolunavupapapana.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/69212539328.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/miraxajomonorikadikav.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jagojozijutus.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gosimire.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/86248448492.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lototukojavoloboja.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/95824068023.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/linok.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109110303565493.pdfIn PDF document text
    • https://tavio.ru/files/file/25381745205.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/30347890908.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///taxetilupipun.pdfIn PDF document text
    • http://vit-physio.de/file/33069551618.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/75527253934.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/bofologixopajenar.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/40971610154.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/5853354869.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xuparutamasikabofiko.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/46278862243.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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 13764 bytes
SHA-256: afaf29bbc26bd8104471c55f6f970a2996242c523f79340100ed5caff3080810
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10636 bytes
SHA-256: 88867d5960ea76480b97353ea8bb0d99419a90d3a8f9154ecadc7179000b2f86