Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31622054d28e45d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 23:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7acd0e58cf92558abc3b4efbab314705 SHA-1: 54f97273bd760078679723efd803f05f6cec9472 SHA-256: d31622054d28e45d20071ea2eb9d4c169c0874bc1cf1016532842a11fbbf8e1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links spread across disposable hosting, reinforcing the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=pirates+of+silicon+valley+yify PDF link annotation
    • https://edenestates.com/ckfinder/userfiles/files/24775582999.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/fupevijavanupitinepuv.pdfIn PDF document text
    • http://hybsch.it/upload/file/4788491332.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210902080005.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/liladelun.pdfIn PDF document text
    • https://coil.hk/upload/files/74829466720.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/kibazajozukizefegavur.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/rajoka.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/zameb.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/xalogovugumagokigoliv.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/30346842454.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gawitorisajana.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3082ec5---64159003755.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/lanazowadunolimi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48f4b917c---83543410538.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sunumezabezujuvevuretug.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/25787004839.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/78713460757.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/kekafavumatibi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/59813163530.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/35372971646.pdfIn PDF document text
    • https://diphong.com/uploads/86395686388.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/datonet.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10512 bytes
SHA-256: e30688dfc6b70e20b893d1a2316a77aa5d5514968c8b286fc401f3a8836793fc
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 19648 bytes
SHA-256: 10dd966a5d45d5f4659710d73da2df9d332960d7f01a35eabebf7fa9a88f74b4

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