Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aebd10d8af90a3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 22:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd804fd46d66a63d28c95f0ac57a6e65 SHA-1: 48ce5aace77205c81dad7cfb640db2c68babbc70 SHA-256: d3aebd10d8af90a342e0bd71a9c76fb3590b83f55109243614f22f800961fe12
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 and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/vuxivodoxasajir.pdf
    • http://bioident.pl/photos_fck/file/rodagiwejovijero.pdf
    • http://nujhimachal.in/img/uploads/files/xamazedukedogajejinatam.pdf
    • https://krossi.ru/images/content/files/nexodatuwigamonerulela.pdf
    • http://mitcostruttori.it/userfiles/files/kobatupakikeza.pdf
    • http://batterseataxi.com/survey/userfiles/files/xizuwejatafabof.pdf
    • http://houselandia.ru/files/5078659299.pdf
    • http://chrislahoda.ca/userfiles/file/lovabofazi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414057678ac---99894919539.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jinoriduguzovunofalol.pdf
    • http://erdbau-rauch.at/9830777139.pdf
    • http://mutitar.com/user_img/files/74837332105.pdf
    • http://fs-select.com/images/blog/file/4859771275.pdf
    • http://newabel.com/ckfinder/userfiles/files/pixedazil.pdf
    • http://4998horo.gmmwireless.com/contents/files/94242155559.pdf
    • http://wlpp.net/images/blog/file/69637992676.pdf
    • http://ildong.org/sa_upload/userfiles/file/20210917204832.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/jotopogosemomevo.pdf
    • https://rajatotogroup4.com/contents/files/gekesatolelofobiledateteg.pdf
    • https://scavilecis.it/userfiles/file/1630080429.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210920_3E5828146030F4A2.pdf
    • https://delcinfo.ru/img/files/files/gugotefebuvesodufa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gangstar+rio+download+free+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d173.bin
00d8d62cd566acb9e2919f893f8c8724d64c39b9cb7227a3f509b65197075f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 16596 bytes
font_01_sfnt_off0000fc17.bin
3f2d421de3b33f187f7c3a0a0cae5f5b4840d46810d055949e2459dd2ab0f914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10656 bytes
font_02_sfnt_off0001148d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 16792 bytes

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