Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15a66be5a7ef9b5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 06:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9832486e50d1f4e4dc6235a5f5552627 SHA-1: 5689286475e536a3c9ca1ec88370adc5d52c0702 SHA-256: c15a66be5a7ef9b52ac39991714619d4b54adfa0efcbe05d593b24ae936c7cab
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further suggests a lure-based attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=justice+league+snyder+cut+dual+audio+download PDF link annotation
    • http://demo755.webbazaar.com/uploads/giwunetusokikag.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nazegugak.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • http://www.pilartangguh.com/file/10212138353.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/33241153165.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54109927625.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/44021920899.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/gilexabatigora.pdfIn PDF document text
    • http://jainfarms.com/uploads/28199599889.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/5475861090.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/64572001857.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021246461163.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/konetiravavodog.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946eda7e48---vezowez.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/dufesesosiximurajefak.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210904183201.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/27293054150.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/zikaz.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xolososugelunuf.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ba87f6f0---tulupujulak.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///80836773890.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dufexifafudemakuko.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/45463192313.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10836 bytes
SHA-256: f983bf36fed99bd6184b59ff5be6a86eeb6b45e682680aea2e56f1018c43ec6e
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 18736 bytes
SHA-256: b74001825c43fd3056fba5bd7a37021f034b31479f955cab4c9f1ec623e5594b
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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