Malicious PDF — malware analysis report

Static analysis result for SHA-256 da01b1b377cdc0b3…

MALICIOUS

PDF

94.1 KB Created: 2021-09-16 12:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 093c49477cdde9a529410dc49e6d7df1 SHA-1: 43676f314842b603fa4af53640ea4723954091b7 SHA-256: da01b1b377cdc0b3e56b9fa1991c654914b1befe89365c581d92a5bd3778648f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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://studiomistretta.com/userfiles/files/50240595945.pdf In PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/69892612092.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wunemaxafoxuxuranupasal.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/verajupetarari.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/52931726011.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/45728372634.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nesafiwamogurepivedinizo.pdfIn PDF document text
    • http://charontrade.hu/data/file/ragofiwakotuzogixasoritud.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbed8bdbf---40607482816.pdfIn PDF document text
    • https://serka.com/serka/upload/files/botizeman.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/sugoluduzig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/goc1jottjkecofdhbjbiefmnfp/91222909107.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/nisibelesomuguf.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/tesolip.pdfIn PDF document text
    • https://kapefashion.com/files/files/77852524949.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/7202440903.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/43979511170.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/tujon.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/kejuzogo.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/kejejezunazagibunuzuledo.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/46400383042.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/rogujatanetore.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tizisagezoxop.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ragijisowoseta.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/65991194846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=picsart+mod+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 2216 bytes
SHA-256: 622fc7a760d6d5abda53d05b56dcef7d338d8e40b76905f6ae32ddc54dbe1c1e
font_02_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10484 bytes
SHA-256: 435e844207dd3557840267d5d98efb5e3ec99db6b85acaf5833337c7304020d2
font_03_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 24184 bytes
SHA-256: 4f9cf0fc4798ef06abb9383dd2152e81a3cc435e5cc83cdc4a50a12d744bdb66
font_04_sfnt_off00015381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15381 16212 bytes
SHA-256: 06f75ca824e33c594950714454ca4dc3bf670c28b947b5a2dd9f30d78c5f8ab5