Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4d60f217f198f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb3e63804aff41fcdcca65e7cb37a0d2 SHA-1: 80684c56d34657e32f82ae475669f9137cda74f4 SHA-256: 4ff4d60f217f198f133d045e760593ded9df0da5a0f493c5947d31dcecd452eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=poweramp+apk+full+2021 PDF link annotation
    • https://sooryasales.com/uploads/file/ganijuguwutululunuw.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60669180219.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/giwibagipemetedozefen.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lugagodetepedefa.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/6800602382.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/jorepupamilukukopamakos.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/32399468857.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/mikexuwub.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/7570507233.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/mukixizemimodek.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff82d28fc4---xubololetufibiguloda.pdfIn PDF document text
    • https://svltv.in/userfiles/files/39398405490.pdfIn PDF document text
    • http://computerdoki.hu/user/file/gipasajaxofob.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/giwegomejitolevimulumab.pdfIn PDF document text
    • http://kasand.com/userfiles/mirevapirotetix.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/gutejowepi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/dapuxul.pdfIn PDF document text
    • https://pmms-online.com/assets/file/donumifidufejiwuxaz.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/numanomoxopemosepatuzi.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/todupibuvawufoxovabin.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/mulamukabi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139502b9ff9e---besix.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/lojufenefisajibiladubem.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/jelozowafug.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/73403252183.pdfIn PDF document text
    • http://c-amc.com/upload/files/zejudowolaze.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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 19468 bytes
SHA-256: 55ea6168df7686cb2b941015ed6978013e602f2f2b39d4e058c438c0108e8485
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10628 bytes
SHA-256: 7d2b933aeaab71ea2f62c896ac7ea97f2311a01e79a91c7a058529ef29ad48f3
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1