Malicious PDF — malware analysis report

Static analysis result for SHA-256 3265f8b3ea18b71d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e32ab895513a8305025335c36c15d51 SHA-1: 972d2cba8c1000d7980b5c6fd81fa7747a398caf SHA-256: 3265f8b3ea18b71dccb92b7355315f5fba99d9cde4bd68b252c4d802a8c0f915
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=stickman+ninja+mod+apk+android+1 PDF link annotation
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/64143434904.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jexafusigu.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/bobimofebugifapomapumobab.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19427716085.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/50465397672.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef0938c22---71382526791.pdfIn PDF document text
    • https://netlandschool.cl/files/kamazisonabaled.pdfIn PDF document text
    • http://forti.in/userfiles/file/10011266725.pdfIn PDF document text
    • http://mweb.cz/images/file/68123441753.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bukuzixiworupetasobif.pdfIn PDF document text
    • https://labelmarket.pl/data/file/vurojiwoviral.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/vobemun.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/jebakedaladunuvibopekit.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/2536005808.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/jasawupazuko.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/bukajejasin.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/209d8850501139b0ccbdb8c7419424d2/tekafu.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/sezugakedikukerape.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/nozudob.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zegapezogoxodup.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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 10680 bytes
SHA-256: 3ba491b157b83499d63751b0f03aca941d4c1e3a6f85b8953392f8ac09481e2b
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16816 bytes
SHA-256: 83b0a4e7514d7b52901ad99d1544292fdcc08a3159277522e65a7cf0fa4c4d39

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