Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05143ca7acde243…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 20:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d1aab6f649c9554de40d550d0eb73f5 SHA-1: 37c3fb36cb4386e9f127351812e0f75747a1daf3 SHA-256: b05143ca7acde2436083b7111f169f9004b20004aef1fc642d2677a3e421a22a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://twapp.freshkon.com/upload/files/zebepupuvelojo.pdf In PDF document text
    • https://mintowncoffee.net/uploads/images/files/35837214781.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109070234381800.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/73111602188.pdfIn PDF document text
    • http://dobermanncz.eu/files/65629690247.pdfIn PDF document text
    • http://feg.vn/uploads/files/dikerozekezilaper.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/mezurixi.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/sadepiwiduzebi.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zatuw.pdfIn PDF document text
    • http://puisan.ru/uploads/file/rigumalivokisizalabuwajut.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gegolokorowigosoxaxika.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • http://dothi.info/images/files/70325106040.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/11116574774.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/44425915013.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/rituketigenuguduno.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bexemurobowebawute.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/pupibu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f657c6ab3---gupofadelumuse.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/12085105780.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/34697103210.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/rilokokozalesalefi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/zejomalezaboxisulome.pdfIn PDF document text
    • http://metabolit.ru/files/file/javokemowarulizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dark+heresy+core+rulebook+pdfPDF 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_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 18864 bytes
SHA-256: 84217a37453303fb30233320e9a6d834e7bb0d099d66fd608d0d893a84be7c1d
font_01_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001557e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557E 10872 bytes
SHA-256: 7472cbca9ddd6a7bd4c4e3b37cf75ea1c5737005e17e82e908f8c838f0551829