Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e9fa4fbebc4c62…

MALICIOUS

PDF

77.8 KB Created: 2021-11-12 11:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c0aeaf2e653f7cc336d1c1998b539ee5 SHA-1: 703d99f98c1f2dce39efa5061016c96ac2834b6e SHA-256: c7e9fa4fbebc4c62f6d17f87a4918c31ab10904147a19813ae4bfb95657799cd
134 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. The PDF also includes numerous external URLs, some of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded JavaScript likely facilitates the delivery of a malicious payload or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155eadd92b72---57121295888.pdf In PDF document text
    • https://nurdagihaber.com/resimler/files/93971941217.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/rezat.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cd918d6b3a4c53b56321608d2224a108/pijujixominuboniratipok.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/noxoxejakajifomipoluteju.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kepoduxutuwunavo.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/13062231493.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202110150901249394.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vurekomatesulanezokeb.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/41918989056.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/90745466682.pdfIn PDF document text
    • http://aa-nusd.jp/kugimuvoboxu.pdfIn PDF document text
    • http://arucax.am/user_images/file/tirebozerabisog.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/46091521317.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/64812479084.pdfIn PDF document text
    • http://toys4boysleather.com/userfiles/file/36021645420.pdfIn PDF document text
    • http://travellerisland.com/files/jisutukupexabenisitu.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93101107571.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/78468544917.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/27166909157.pdfIn PDF document text
    • http://vhz.cz/user-files/21273215843.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/13977214326.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/vukewokapetok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=turbidity+of+water+is+measured+on+which+scalePDF 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_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 17676 bytes
SHA-256: f027246555cc0edc4b46a07302187bc5e5ea9a77fcab303f78968df06ab29f85
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 11144 bytes
SHA-256: 8e885c644b3e1f4ef4deb9562e1f9a886746953f064fc496d5f5f58d0936c3e6
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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