Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f0bdcb49287e2a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 00:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed5031cade5709150cfcfc8ec719ce2e SHA-1: 0480b3369cef21bd724847a85d8ddd11a1ce67e0 SHA-256: 73f0bdcb49287e2a71a2831566a7c59f774c978403b494247c23ac27a9f1025f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=streaming+twilight+breaking+dawn+2 PDF link annotation
    • http://midel.me/userfiles/file/94281928401.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/85224383566.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/35949248639.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sularexafene.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/tezalakomibetasogimufo.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lurusomegonugegokuzuj.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210917_022538.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a8a877fc---32333298164.pdfIn PDF document text
    • http://epmachine.ru/d/files/jobamakepumunin.pdfIn PDF document text
    • https://invision.buzyhub.com/files/13672065888.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/23851874585.pdfIn PDF document text
    • https://afayl.com/userfiles/file/33945695442.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/80642896126.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/98493062496.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/filuv.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/zagivowu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36481649848.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/totebupeg.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/girad.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/sasaleditanir.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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 15812 bytes
SHA-256: 271e803e6a0d62e9bd71d11a03cb88e333039a0ebd810f4792ec55901faf4930
font_01_sfnt_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 10920 bytes
SHA-256: 3c2102113b7a551cbcb44ce80c5cbbe9d2e9cd365fb9e1fefde0359d6ce309c5

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