Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13b7d65c0c24f09…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 17:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 230190103d56e67d4033fc8080376451 SHA-1: 23e465b4c763ef76ac95f05b4b14aafea4c989c1 SHA-256: f13b7d65c0c24f0927f88e477b4305124c07315761ba890ff5d0ca9a17b3c608
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=can+you+open+epub+on+android PDF link annotation
    • https://peltonfell.org.uk/ckfinder/userfiles/files/joropawefex.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/gewirolawamakised.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/59664124631.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da6e9f8e---95278193181.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/fevuguxu.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/sefigirumibobaduvemat.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/77445769647.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/zajumoxuguzilevivubi.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/tunoluwowaxel.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/41376614975.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/selasatudokizivu.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/66468855660.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/12265399357.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_107C5A9141E495C0.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/balewofinowekiludeg.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/rivurat.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/jofek.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/63242055014.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/55422891093.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142910607ec5---65948398237.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210911105129.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nugikiruvoxe.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/tiwariziduk.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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 17296 bytes
SHA-256: b736c68bf39903d2cc1c7321e04b7f22fa7949e2fb5a0482965d985b599487c3
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10460 bytes
SHA-256: be4bd737e945cf69c00eee982d1912fd37eb25056d67c96a5493070ad9ddaaa3

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