Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f9a35d3f1b43cf…

MALICIOUS

PDF

109.2 KB Created: 2021-09-19 02:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: decfb90e349a95e409680ab3b9551fc5 SHA-1: f9bcc621e5d13761585c10f4c3a5c12ff8ea1782 SHA-256: 85f9a35d3f1b43cfe95ee62c8ffbe79b5a700eba03872c9054e46c4142e3c222
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, with many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely leveraging embedded JavaScript for its payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://huangs.tw/uploads/files/202109151334534884.pdf In PDF document text
    • http://costruzionibulagna.it/userfiles/files/77511980070.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/26837193227.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/74098720037.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nufugolob.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/57586884420.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/7985755044.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/91076668778.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/puzedaxujifu.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/duginorunago.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109182204543165.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/13324805426.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kusigi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/42512061154.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/57259944504.pdfIn PDF document text
    • http://bamila.vn/luutru/files/fasukanemejuzamosofedisi.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/14059686863.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/66667787950.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rezuriludulasorava.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/94255407595.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/40769890569.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/14945006667.pdfIn PDF document text
    • http://mega.kz/media/upload/files/59790620512.pdfIn PDF document text
    • http://jawarakreasi.com/file/derataberoxugowerimit.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+pearl+ar+codesPDF 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_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD5 19636 bytes
SHA-256: 51804114c127f8aabc636ffdf74a8207d9cc46727e594c0f8066c45368213f4c
font_02_sfnt_off00018edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDB 10576 bytes
SHA-256: 05f9a48e69b7e42bb6a0b3034fe0dffb3dc6b278d15ebe75e4d7c7957efb40bc

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