Malicious PDF — malware analysis report

Static analysis result for SHA-256 4768c5b51e177387…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 09:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c1d143b1e149e82440a069d230c6eea SHA-1: 9e9c92f19cace6ffadccfe02b540771af447cbf2 SHA-256: 4768c5b51e177387059e4c7f391b900475ab4e636683a7c31ce012f77385ab35
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

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://philabc.ru/uplcv?utm_term=onlyfans+premium+account PDF link annotation
    • https://onecre.com/images/content/files/19570560103.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/51401054767.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/minal.pdfIn PDF document text
    • http://chieucoingason.vn/files/67669091405.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vibutakide.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902165924_1743654056.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/10419579070.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109110404032206.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/71809320495.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/wazoten.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/1383384067.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/59722701360.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/16223450122.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/41931171917.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/44452609942.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qhrijtf9crbod1vd4kkufluqod/32389339948.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/85218020029.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/65569213284.pdfIn PDF document text
    • https://slide-bearing.com/d/files/95883813060.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/61582242452.pdfIn PDF document text
    • http://telecycling.info/files/file/ganufazifakumodi.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/burunab.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/80903762218.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12329375817.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 17836 bytes
SHA-256: 5c69cff916f025397c01b8a243e935f185f421f950731c92d1116cf89e50e815
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10880 bytes
SHA-256: 5b2b027743b7c43ca952cbd73d091968dbb26e213b7b25dec13830b75ac57966

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