Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5de584173da1b79…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 15:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7181ed4ffb1ec8b2a44d892d40fbfecf SHA-1: 6ed4f185bb5a33c438ea1805ae7301b9b5cb3270 SHA-256: e5de584173da1b79d182c3645022622bd9ed830da1d9fbabe477ac070cf34811
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files, suggesting a multi-stage attack or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://boldogelet.hu/media/28361625724.pdf In PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210913075728.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/vikusidanufopasenipel.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1b84c213---24448581349.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/31628485140.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/65554581906.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nipufuxapuxoji.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mukizatovixir.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0d4e2d898efa6fb8f66b1849f3261597/zigoworijegakopujeduti.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/lizixilubuna.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jazudalakusunikowuf.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bosivebewawov.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nekerimaniba.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/kurubevafivegaxivu.pdfIn PDF document text
    • http://inercial.es/uploads/files/molakevosovewaw.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///28662429573.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/filolevixarisasar.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fesazimasizejixofoje.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/13842917930.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/fakabuberedesefigodoje.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/ratoz.pdfIn PDF document text
    • http://travellerisland.com/files/13731605880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=initiative+dungeons+and+dragonsPDF 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17104 bytes
SHA-256: 5096259391532e3a97941194bea61502c82a9d0032b96367648c7ce5c4740889
font_01_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 10492 bytes
SHA-256: 01b24d5bfbc4aa1b784d87d5432ee4a08a96c9a31d34316d2b320c20c9fc8d9d

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