Malicious PDF — malware analysis report

Static analysis result for SHA-256 066510499cc16ecb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 07:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9fa42e31479e6d131525bac699ebee6e SHA-1: 00008f2658d40a3e16cefc6964aa2a6d4881e833 SHA-256: 066510499cc16ecb34ec15211a021c0a0315b3a35d9e7c9441308e76abde0099
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV detection and ML classification further confirm its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://vettercycles.ch/userfiles/files/gaxuxabekasap.pdf In PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/85862489317.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/rizutelawajagemil.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/51647615623.pdfIn PDF document text
    • http://pactolous.hu/upload/file/4029162594.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/64647597018.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/77363414004.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/lejuwawusube.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/5943156077.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/37657903887.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/98281810916.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/68892667610.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/95529402989.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/66163435893.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/47720238000.pdfIn PDF document text
    • https://ka-base.no/images_content/file/ledajugotizabisaxapiju.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613778b1c67c8---nabiwe.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/6941065913.pdfIn PDF document text
    • http://ruihuitax.com/files/file/danuvunabo.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zakela.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613370c440c26---sinaxefazumow.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631010047.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/33353473594.pdfIn PDF document text
    • https://anandalaya.in/resources/file/jemopul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+text+messages+from+android+to+android+using+bluetoothPDF 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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 11220 bytes
SHA-256: 84dc1dd1fd9e1fcc7d034a859ffdce97767d6159bb761f60926e8be3d0ea322c
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 18208 bytes
SHA-256: 291ad6d759c7d4c89c300d76e467da2c3abbf9ec9bad0eb568679eeb18e75829