Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f60c43e06393e3a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 04:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3021077533a097eb04b30c5407802cea SHA-1: 43823cc933095957ff78959930dc83801f2cbe5f SHA-256: 5f60c43e06393e3a829b08a21ea4e38db9dcb458a81ecfe799803f880457e21c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://crysiq.ru/uplcv?utm_term=torrent+fear+walking+dead PDF link annotation
    • https://stalbeckers.nl/userfiles/image/file/78044051816.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161493a83860d8---nedujeji.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/84890248867.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630639232_1.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/92998450317.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/65916266627.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/juwotemubiwajubifuza.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79611424156.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/bunasu.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/vaxad.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q82d95dtdjbus7fgsdsqi2ldc3/65049436979.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/pituxamuxowelexes.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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 10504 bytes
SHA-256: f1d0f2b9952db11cc895efff901c0d49bd2301dddadcf713cb66452da3cdb042
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 17572 bytes
SHA-256: 0ba30a7d5fb620af68bdfdf05126c958e47433ffef5b668d3d6f70564f676502

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