Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3947236d1c4518…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 08:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd5d6a29b5c80ab1756893161dc4b159 SHA-1: c929d06baa896719a72dfa766105c824874581eb SHA-256: 8f3947236d1c4518a9f745dc47643e0138ad865073b82008e75923ec39a7f081
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=what+if+serious+scientific+answers+pdf PDF link annotation
    • http://metrocars.london/survey/userfiles/files/990983184.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109062226153407.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/woluvamuvurenuvez.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/53966173569.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/87437797655.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/36124233780.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210908064749117.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/nubopufowo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eb0e6eae47cc009f775b1978926e8070/begofojopek.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/98953938c7d87cb31d01dc70b4aa0dc2/lobewuwuno.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/66428974064.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/bereduzufukapogosulil.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/81845568867.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/ratabewe.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/21549477111.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/mamajop.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/41939682150.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/noxit.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/wivemufipidup.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/saferatujutukudo.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/dizulerimirogexijatotasat.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/39882365760.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/ronepaxuniwidojo.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10852 bytes
SHA-256: 057655b4c34d2e00354040ac3ee9d6b52a51fcf00384aa883535c9cf6a8bca0c
font_02_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 17236 bytes
SHA-256: 7a576de5c51aa2b319e11f60eca22a0bf8a64eeaeb1cfcb62bcb30607a0d2713

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