Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c61e25f255fa41e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 03:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c022cd1634504eb2f5d4a837f2752c54 SHA-1: f08b4a1aea89a37e2dc39f00c5b728584af0945e SHA-256: 9c61e25f255fa41edd19d87ce0e73bfc6d8979cf1dcb62ad85e2c86cafebf0c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to obscure the final destination or distribute various malicious payloads. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bulongvungtau.com/media/ftp/file/verakewajikodubujixiz.pdf In PDF document text
    • http://a-b-i-s.net/layout/bilder/file/76876054438.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/5106176652.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/64526418913.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/305c51b3d5b501430a8fa3cb49f0daba/88750763755.pdfIn PDF document text
    • http://linza-market.ru/upload/files/98376771176.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/rigoke.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/77121015182.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/54120772791.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2aaf38e---midominezobuv.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/64547621890.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/91100140098.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kovobugijorupenunan.pdfIn PDF document text
    • http://artepcb.com/upload/files/sesevixipu.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/77608184768.pdfIn PDF document text
    • http://espicycooking.com/files/file///68827966904.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/pazofa.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/dafolekota.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/78523295100.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/3294127386.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/sinage.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/97777817482.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/55846892589.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/1036799487.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/tomanuwelirab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prize+claw+mod+apkPDF 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 17416 bytes
SHA-256: 1bc2d8c94feee1c2aa6e50feb8e0c1bc4d266d9fb7ad1172f52794b0ec518e0e
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10544 bytes
SHA-256: 3bec895b5b7e33b26a72c1d89919a05a03012ee1c79d14ad2431a1a85d3951e9
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1