Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c68c6e684661640…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 01:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 228a55c2293db9694a80d26aa4d14b19 SHA-1: 4658b166eb51cfeb5cd786b4f904ce295776908e SHA-256: 7c68c6e684661640a08f2aafcf7ec03553e614c5566d54cff03d361efe759c03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=hbo+mortal+kombat+movie PDF link annotation
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/58743273928.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lalujapoviwutut.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/11868287573.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/tilezurujob.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/13808465226.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/xirebuvoreza.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/11717220605.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/jufedi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9ea77be---gawuk.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/49824266126.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/74641766115.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/wepesuwowudazibak.pdfIn PDF document text
    • http://haai.org/upload/file/vabefuwesofojuno.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/57581413735.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/90255872022.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mujn564trdvu2ma9n8he7gp3g0/rutatof.pdfIn PDF document text
    • http://canadanur.com/resimler/files/puxezuralowe.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/wifamirinovotonakofajiwak.pdfIn PDF document text
    • https://maisonforville.be/documents/file/17101632902.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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 10288 bytes
SHA-256: 5f1f135f4572b8b7cddc4a004c5c374fe828e2bc96847e3122d02a28d520c5bb
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 17972 bytes
SHA-256: d412a870689fb83aa64e87f44517657cbade306d85eb45a9915c9c0a558bbefd
font_02_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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