Malicious PDF — malware analysis report

Static analysis result for SHA-256 36840089d464387b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 14:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef1146dc23133220d02387ca5461cf8b SHA-1: 3b5fefe026e5903cda5650a590af589e362f21e5 SHA-256: 36840089d464387b07b5385afed6f173e6cdcf2dcf6aa0f4bc4b1ba9b4d4a9a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=hill+climbing+racing+mod+apk PDF link annotation
    • http://yuli-china.ru/d/files/pagepivuwubumubela.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zazuxekekonubowesexelunez.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613888934f2fe---60660007616.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/43763762061.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/4871354548.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/bafexotuxaxuzipe.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/vosegaferakobod.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kenub.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vavagosiroxebenujixogez.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/xitujuwokuba.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161315713d659c---4206818835.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/57970914892.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/risefa.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/tezeladuxulurinenowowalin.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/42419326432.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210913095536.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vowuseditufol.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/14636517450.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bipefuseli.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/sopurolidakonalulovos.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/72102582605.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/momufoperedupapofuv.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/wedimunamigurujawul.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jazivinikerederagamef.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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 18316 bytes
SHA-256: abcabda7ecbaa3753527fab6663650cdee6d495e91ab4521d312fdb37280b178
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 10684 bytes
SHA-256: 484b4fac5cfee8d815ab6eb373b47f6d230c3e884c106776fcb10cbbd9edf9d7
font_02_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1