Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba04f63a1fe7019d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 15:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6334e1083284deb59fc8e19a636bac2 SHA-1: 8da436bd7f12f7e827347e645b5f3e92ba4528fb SHA-256: ba04f63a1fe7019d5b0d75a350b60f06719810f70948353800ab6dcc934fd75b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, suggests the document is designed to redirect users to malicious sites. The primary function appears to be distributing malware or leading users to phishing pages through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://nomylo.ru/uplcv?utm_term=rick+and+morty+season+5+ep+3+123movies PDF link annotation
    • http://www.salac.cz/ckfinder/userfiles/files/77198447586.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/rowimezudof.pdfIn PDF document text
    • http://webs123.com/userfiles/file/43309554361.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/31979102600.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/60048893782.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/pifum.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/57385254780.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/44942468394.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c65da8b---pojufediwul.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/gigorujakijiga.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/1650934367.pdfIn PDF document text
    • https://timminsrenovations.ca/file/hFdazc2TTqPo6P1q.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/pulogimekikovigaganalawe.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/guwet.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/wunafetodafev.pdfIn PDF document text
    • https://linardi.ru/files/file/34684454775.pdfIn PDF document text
    • http://cpils.com/userfiles/file/katoxuvowaxobowox.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/sazep.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/koloderuxa.pdfIn PDF document text
    • http://nfc.soo.jp/file/40593784368.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/fepemax.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/niwubagezezomebojiri.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/10870462317.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219131121326642.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069f1c32ed---lawufezagulixazagesipixis.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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 11424 bytes
SHA-256: 53b8e14c632ae8488251296d5f301ffac78c75b6c9771d09d3e6718a1ae3835e
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 17928 bytes
SHA-256: 9a356cf3f5e4cd7c058be8194515e8ac9cd50d7f29c9873a17e9e0c1bc30c8ee