Malicious PDF — malware analysis report

Static analysis result for SHA-256 766bb2229b9991d2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ffc361a3564cd886ce7bcfbc046d383 SHA-1: b9be27681ad6535d60c0f89bef86d3444584fe32 SHA-256: 766bb2229b9991d2aaea61dafec6cb14fe0f5b778e980ff9a680de42e8d2b423
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are likely disposable, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://7seapharmtech.com/Uploadfiles/files/19052328036.pdf In PDF document text
    • http://hkwwta.org/userfiles/wojifakubonopivevasodime.pdfIn PDF document text
    • http://videlec.be/ressource/file/nejawopadunitej.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/74988572055.pdfIn PDF document text
    • https://777mto.org/contents/files/bewifa.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/50800204598.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/64597791149.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/18094316902.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/57091008595.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bamomubuwufewix.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/kajanosupurotezexi.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/mutilono.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/depaxawafanetubutirimumuv.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/dujonusegasulemivalenez.pdfIn PDF document text
    • https://viceda.com/userfiles/file/kejoronope.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/funugibad.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/69848373427.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/56347745707.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cfd03c7647f7864d8e3d8eb26f341a6c/nisanikudubazos.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/105991768.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27ce1aaf04fc85d949ed94d8b5d1f1f2/68101205851.pdfIn PDF document text
    • https://congchung7.com/upload/file/99807918705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+give+root+permission+in+android+phonePDF 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://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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 17620 bytes
SHA-256: 86af10ad6242ceb5c7e98847a1b7801d2616171fb71976b69e6de34f6734fe85
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 10936 bytes
SHA-256: 8dee45d124726f8eda982dbe186cae4528e7a06729adac9bf3098ecda09c7aa0