Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f6ac6acbcbe378…

MALICIOUS

PDF

81.3 KB Created: 2021-10-17 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8665bb7a4df09a8c8c995cc805e5b5d9 SHA-1: ff10d25cddec28f9bd7b37eda499800ecc734252 SHA-256: 44f6ac6acbcbe3785967f598d8072e014e001ca84fcceef0aaea65d1f345cf70
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links point towards a spearphishing attachment (T1566.001) used to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://nuitsdartistes.eu/images/file/68829560593.pdf In PDF document text
    • https://kakakmanis.com/contents/files/divirulojowidifofe.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/85841023879.pdfIn PDF document text
    • http://kbchina.de/upload/18891766866.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/93422995099.pdfIn PDF document text
    • http://domexpo.ru/up/file/ruxid.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/14708436653.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514edca6f11---fitamepugiz.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuxigubunir.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/97500371538.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/gifematoga.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/venaramemepabad.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/42195498765.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/givifirameduwuk.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tagakimugatugose.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/fenubotumofalabajedew.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/sererisari.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/35556797499.pdfIn PDF document text
    • http://primaneighbors.com/userimages/30015603302.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/31125319532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=the+fast+food+songPDF link annotation
    • 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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 18464 bytes
SHA-256: db963f0e828e310bf282c38694117bcb471247a49fc57f718f6a730ff2b3a14a
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10356 bytes
SHA-256: a1089ea8d1fde774320d8dccb7a29f71cc21dece9f7a60adc72e99044d481583

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