Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9539573d65ea98…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 13:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa1df2026d562009cd897d64b9151dda SHA-1: 77f4e8d6aa0825a1201ca33ad329369cccbd18e5 SHA-256: 9b9539573d65ea98f04ceec15375bc084a96f27cd2ed7b8cd8e04c18f6e77b9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the PDF is designed to redirect users to potentially harmful websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or host multiple malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mosme.org/uploadfile/files/xibimobelamubepu.pdf In PDF document text
    • http://goodfortune.hk/UpLoadFile/file///poribuz.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tazawezerutudize.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/wasunamugizaxe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/46290814.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/42730758125.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/55457626690.pdfIn PDF document text
    • http://aquatherm-graz.at/files/66043582948.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/rozuxewe.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/705204159.pdfIn PDF document text
    • http://marine-inox.com/i/File/gobegosoboninuxomatesame.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lexizas.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/4364693895.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/48393825318.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/43678999495.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/zominezasewopaluka.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/42259303838.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/mutirenufilu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/74189445733.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/fuxavogebasibakuwafidozet.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jiwujenujeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fruit+cut+game+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_off0000ae40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 15920 bytes
SHA-256: 60b9178f17dbe291bbf9d41762c48561c258c49c05f2f8baf3fad3c584949e1e
font_02_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10448 bytes
SHA-256: 9b775d629ef022e10f1f97f632a131af2cc5b93f21580da3d260c29fbe43eb54

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