Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bdba7048d3addd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 08:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c749a6f0af1b86239c213d37b6952049 SHA-1: b1fb3de1eb768577174cc200da0ff171d540ee08 SHA-256: 73bdba7048d3adddc11ed2b985fb25ebfc502a7ab6be986e1aeba9560bce2c52
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.highlandernepal.com/assets/ckfinder/userfiles/files/10918504370.pdf In PDF document text
    • http://amkchem.com/upload/files/lafemepurijedapavilijame.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1133df614174290490a35b3a65f1c12e/16377529344.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/dosedibexol.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/loxajatedetapopeso.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/bujugof.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/189084630.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/31145404698.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/41813028393.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/xiwigumasubitudajopawezi.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/fusovovorovananujunipe.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/vifejosirazenufajojig.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630696286bAmK.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwif.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/58153227206.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/61373914386.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71193787614.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/53784636781.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/3254296482.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sunabe.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/zulokuwerexizexakaxasugoz.pdfIn PDF document text
    • http://sushi-belovo.ru/files/45116174299.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/guxifonomubijuzikeduduj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140437cb1dc0---wimaguk.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/52779959295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mohalla+assi+full+hd+movie+downloadPDF link annotation
    • 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_off0000c2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10664 bytes
SHA-256: b1cea8ba67e64bf82fbb3b9239fa6c96bfd4a0bee7d6cba2e98397de1123d75f
font_02_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 18028 bytes
SHA-256: aeb911707387e1005c9d465be85843e1460e8200b4a1abd4455f85536a4aad65