Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ee07541d87903c…

MALICIOUS

PDF

148.0 KB Created: 2021-09-13 11:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb8f7daae38720b2186e2ad9b656332 SHA-1: 564d265bda58e052e345ba08cdbdfc7ff3e63adb SHA-256: 36ee07541d87903c4ed831b0475d642e4b8a03f1ed13ddca03b7c3b8fb810cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a SEO manipulation or content distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 http://easytravel63.ru/ckfinder/userfiles/files/64148666393.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/56078337907.pdf
    • http://anadolumatbaa42.com/genelresimler/file/gotuzusovodunixapifomalu.pdf
    • http://teplorium.su/userfiles/file/bolatupidinufekomemuka.pdf
    • http://www.tobywells.org/media/fckdir/file/42569055555.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/32499610215.pdf
    • http://scoutpate.com/userfiles/file/82735381874.pdf
    • http://rmgoals.com/userfiles/files/sufosugikixo.pdf
    • https://it-remarketing.pl/app/webroot/media/files/ganobubopejisujejadekil.pdf
    • http://rilta.net/userfiles/files/62271018845.pdf
    • http://lactopad.com/uploads/files/8846089541.pdf
    • https://hotellemaritime.com/hotel/upload/files/nuxavujigiri.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/64982971301.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613226c5c69df---petagowoserofomatireg.pdf
    • http://upnbkk.com/file_media/file_image/file/famokogobu.pdf
    • https://desense.eu/uploads/wysiwyg/files/xetilifefejuponebu.pdf
    • http://arablift.net/userfiles/file/81720578042.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2e51fa70213484a85f91ad320f700701/verujekopovorofukipogovax.pdf
    • http://cuanhomkinhtoanthang.com/media/file/dubutoguwozolifatanu.pdf
    • https://adverto.ee/userfiles/file/zopiwuf.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021091223120873499.pdf
    • http://rem-proekt.com/f/file/fikokewemaxome.pdf
    • http://naturalmis.com/userfiles/file/wirajupajovepubuzu.pdf
    • http://pataibicaj.hu/userfiles/file/rosejirefemabuv.pdf
    • http://steinemann-ag.ru/wagajasopoxesipubuvapiv.pdf
    • http://novafish.it/userfiles/files/zodatomiki.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/lelobomuwosokujir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+get+signal+strength+without+listener
    • 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_off0001dc89.bin
9b823a644f12f6f817f3fa955f035c2ae26b3dcb7efe22d2ef3e4d68739611d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC89 10692 bytes
font_01_sfnt_off0001f4de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4DE 16792 bytes
font_02_sfnt_off00020cf0.bin
2262fe7317b19c6ff2f77a67344b3723bbb3d42e75f368213d58b262a4125e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20CF0 19648 bytes

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