Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96549f6ef5b549d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 21:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1f801dd5d99a3310a310b7b6a5f3a6c SHA-1: e2accbeb9ac5d64d8f91da1117ca62173da0cc2a SHA-256: b96549f6ef5b549df5adcd5ba04b2d666c6862da8e9e9ec1cef4d59e3f8dc0a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=web+based+android+app
    • https://ecoolteh.eu/galeria/file/kajuvopufipodivexereziva.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xusujerovimuzelejijuguk.pdf
    • https://beautydent.hu/editor_up/nekopekuzi.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613870a291fff---86049335022.pdf
    • http://zeci.nl/im/image/47510388181.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/19400744072.pdf
    • https://sambelteri.com/contents/files/79016749365.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/balolorux.pdf
    • http://andlupa.com/userfiles/file/43049358272.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/lamovosepilimix.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/99928971121.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/wevixazetaxozenomubu.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/mivivi.pdf
    • http://honeycontacts.com/uploades/userfiles/file/95006675587.pdf
    • http://haisushitogo.com/uploads/files/kezedixuxowabelanolisizi.pdf
    • http://scandinavia-ex.com/images/blog/file/77646743690.pdf
    • https://responsible-tourism-alliance.com/content_file/files/62439635132.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb9f5c1ea3---bipiposa.pdf
    • http://mgrima.com/files/file/27867175942.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/sajewesuv.pdf
    • http://kyanite.tv/userfiles/file/42594264097.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/durutamadamamovun.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/dimogiwogawabaj.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/59422421366.pdf
    • http://yucehukuk.com/resimler/files/76233992956.pdf
    • http://thietbiantoanttk.com/uploads/files/wotemoladura.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_off0000b404.bin
46bf5c3146d9170000d3009a8f1daad3aa3b21732e138ea9bdae9c4c01c94424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 10372 bytes
font_01_sfnt_off0000cb60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 16792 bytes
font_02_sfnt_off0000e372.bin
d1a52e675c466a0704fce9dbd101953d4fd97cf44700a6d0adb29e8ff9f02779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 15272 bytes

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