Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c8fb1760fde6b0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 14:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d3a4c149a049317ca5603c0dde57017 SHA-1: 3f2cad91f39596b775f47faf2980b07511cfac28 SHA-256: 62c8fb1760fde6b07c937336232ef57f34dcd0807cf09f9e47248de6e2335fae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for SEO poisoning or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to a network of disposable domains hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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 http://hysansam.com/fckeditor/userfiles/image/neliwokatipajunoj.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/67544917107.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/sinazafejose.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/73170952282.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aded.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/91647872920.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/zatezepofuseromax.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210914_A79E1CC3881D6D6E.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138b2f4e330d---84524404912.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/63033391756.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qvev80gn5p3fktqirr0b16qjat/zarewisaj.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/darebesuduru.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109102044584155.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/poxizidiselutizuniwepi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/sixalibokafalerowu.pdfIn PDF document text
    • http://qdjshg.com/files/file/90846446657.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/3468138854.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/2630363241.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tevamorif.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/wokoxaxesiz.pdfIn PDF document text
    • https://tcremich.lu/files/files/punavolinix.pdfIn PDF document text
    • http://labotinnghia.com/img/files/16808991430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=redecor+ios+hackPDF 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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 19504 bytes
SHA-256: 19b7ceca3ab24d2d43649ee680d8c4ebc25f352064dbeaf309a1c1714876bf3f
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10356 bytes
SHA-256: 791bbc616396d42be07723cd71e841736e3b1e1da8c7013894d3df3f6110c2a2

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