Malicious PDF — malware analysis report

Static analysis result for SHA-256 5921f879823cfab6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 07:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54664268177a25022ad748881b80b7e0 SHA-1: 1200a4109d11022b8dc0d7bb1e9bc1f2c1c85eac SHA-256: 5921f879823cfab662855b19855d52c6ac80fbbbc33edd659fe8cbea22836552
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is designed to redirect users to external sites, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://drafthe.ru/uplcv?utm_term=convert+epub+to+pdf+large+file
    • https://partetesal.ir/data/file/74094829520.pdf
    • http://juentai.com/userfiles/files/wazepewe.pdf
    • http://sterenstein.ru/userfiles/file/xusupetaradasa.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/26320982320.pdf
    • https://nmcs.ca/userfiles/files/44257131637.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132046fdc5da---keligesutu.pdf
    • https://solener.info/ckfinder/userfiles/files/wekop.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/42238235370.pdf
    • https://solidpractise.com/files/userfiles/file/mexijojefik.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vewilakeboretekapekezasof.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/mapikafebofu.pdf
    • http://copingconversations.com/userfiles/file/kujabenufozenaralalexilip.pdf
    • https://visualarchive.bg/files/ferituromadatu.pdf
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/82102405077.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404b48edaf---77618886372.pdf
    • http://angelescare.com/userfiles/file/ropikisuturinuz.pdf
    • http://lechioutdoor.com/userfiles/file/63834128792.pdf
    • http://vallovin.it/userfiles/files/loxoxixalobij.pdf
    • http://www.ondebiz.com/userfiles/file/poridosejezonigekosa.pdf
    • http://tonioloclaudio.it/userfiles/files/66932032528.pdf
    • https://tramtron.vn/uploads/files/files/82897510926.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dijunutozowe.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdf
    • 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_off0000ccf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 16792 bytes
font_01_sfnt_off0000e504.bin
85759ab962ecbf74b4a2850775ad1bfb017bbb4f3bd2d0ae2b335e64ad00d336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 17316 bytes
font_02_sfnt_off000111d2.bin
3af17e442c8ceae83ef4cf778f25d673da2d9d1d82675800678edf244b3b460a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10844 bytes

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