Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5712bc92f286f6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 11:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 493d69679e7f4e670a23211f4fe8b7f6 SHA-1: 73719b78ef114fd0249469e4bcfa24c200bff6e5 SHA-256: 5e5712bc92f286f61bc65abe562b00cace6d028ea21023a99ac78be0e99376c0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs pointing to PDFs on various domains, coupled with a heuristic identifying it as a link farm on disposable hosting, suggests a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8842

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://samirkumarpaul.com/ckfinder/userfiles/files/30268026280.pdf In PDF document text
    • http://wakabaeducation.com/userfiles/file/fesiziziworivosewitixami.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/22909566120.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/52589604035.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/rutoxuro.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/tojamoxisuzakowabeli.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210916193339_1170054513.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/vevuwividakipoduw.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/zigurus.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/85458906667.pdfIn PDF document text
    • https://promise-land.com/upload/file/45803337463.pdfIn PDF document text
    • https://medpressa.ru/files/file/22705354091.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb954ac9a---mebopuwex.pdfIn PDF document text
    • http://philipsphotographystudio.com/54956505355.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/sewagavako.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/42899956586.pdfIn PDF document text
    • https://fishuntpesca.it/file/konejome.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcba18591---gogivuxaxaran.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/zuxikixejutalodabokuku.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/58786996747.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kifexowewisosiguruw.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/84292042626.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/seruzalove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+oddworld+stranger%27s+wrath+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 18544 bytes
SHA-256: 01a70f7f3e262f87d06edbb097ae55cf867b80ce8b84634b2070b181061e88ca
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10912 bytes
SHA-256: 1ba25022354d019b17b561e685f9f59772f907bdbcf27541f7e555c8a5e248dc

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