Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4688f006953298e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 15:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 462d9f3201961a9d3ab5a8366d10efbb SHA-1: 3bc85059ad6bcc9aa2de78438d54cd3b6c7cd3a2 SHA-256: f4688f006953298e6131940155e10eee482ea30bc6c4f3decbc3b2574eb7f860
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • 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 http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/31918830641.pdf In PDF document text
    • http://fecirturizm.com/resimler/files/masimubepi.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zomubodeduv.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109171451394487.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/mapawodumoxekukilenup.pdfIn PDF document text
    • https://nada70.org/userfiles/file/6810337115.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/2775187219.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/sulazigi.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/xumeju.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rejuderaxonewez.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wakaper.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/84049618295.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lebuvefevejakono.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kajazibulip.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/23389196621.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/69402312373.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/pozedod.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/gowiforovexevukixafu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nonufiviberetuzuz.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/bokupibekope.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/nolipokugasigiwut.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/12088765247.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/fosezazifadoropamup.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gibex.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/52823744266.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f626da0ab---28483899254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=windows+10+upgrade+to+2004PDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/95388001542.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 11072 bytes
SHA-256: 025c6c0fa81f1fc28c2c0c7468bdf7d2e4467bcf046ed99c74fe0c83408aaf72
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 17928 bytes
SHA-256: 757abad8c6044a1c05ade1eb84dee8b200b77b264b4696d277556dde11937a31
font_02_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1