Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3f23872b918ed5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 01:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1833451a848bba813a05c38d6a9942a1 SHA-1: 7ed2d2fe90ec4ec913700f9147c8b87d8dda2513 SHA-256: 3b3f23872b918ed5fce2d612ce137bab8976bea7002a52f6e8cf6311ee34aef0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=ipogo+ios+free PDF link annotation
    • http://mybed.tw/uploads/files/202109180843558551.pdfIn PDF document text
    • http://gensugroup.com/upload/files/50068447071.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/2038281844.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/borivafinisoxuw.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/sapajoxoxemezuwope.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914042514188607.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613739ec9f1de---zilixekirud.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/48905109878.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22359267096.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jaluxojorupekorimuzutago.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/jurodabesedebunodupezebip.pdfIn PDF document text
    • http://emannsltd.com/userfiles/53943726799.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jivop.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/4634387331.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/jubujefuwurimejumusa.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nipewulusifolivi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/lokinebevunez.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138b04abb0cb---50702578376.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/penar.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fubatanapevemubalupufujab.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/gexegowozonewovusud.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kepagose.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/jurumolubisidasugeke.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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 20348 bytes
SHA-256: 7f1b8715ea2069527d24c31ccf649f37c32e242ba3c3e89bd26782b7d471a6d4
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10072 bytes
SHA-256: 6c27d4888ef026f4da211d21f28ecf7d7b74fa3c485e38084b24b451f1aceb9f
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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