Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b3cee66fecd8e8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 990c5e0b2df09a3a0df4c8b510807d5f SHA-1: 861c835b838d4433006c939d4c0f583ffe05467b SHA-256: e6b3cee66fecd8e88e588375c7d55269bf1180e2acd0bdd5050c0f5e5cc63a64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, suggesting an attempt to redirect the user to potentially malicious websites for phishing or further payload delivery. The embedded JavaScript is likely responsible for initiating these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://c-six.it/userfiles/files/18347921496.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/11680762080.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/jevoluzexamolusugotatofi.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/92661315364.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xoxirabutere.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51145585230.pdfIn PDF document text
    • http://ucokampen.com/media/files/fuxudiwamupezaxinetidoj.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/pipiguwubefi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba571db2a---36474765020.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/35012843293.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f956279df0---bibofunaxotid.pdfIn PDF document text
    • https://samowar.me/upload/file/49530541178.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lezusulujagadogut.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/89225484755.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/2858247650.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/20159352235.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/87493673494.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/70672642002.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/47989102528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=close+windows+androidPDF 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_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 16296 bytes
SHA-256: 3f088f4af5f7bb2b1580ddfebc0a9d9810efb3f83aaffe86369267f239bdc4cd
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10260 bytes
SHA-256: 0d84ef2001b00302896533c781b0a5936179b6620f2e15cde037c0a14503ab3b

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