Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fbf4ecda25dc1a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 14:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 60f749fb06097644f9637e6da6d6e77d SHA-1: 5413af912d612f71f2f41ca831becd8a82f09d89 SHA-256: 02fbf4ecda25dc1ac987f30caffc3e07f004133d8583028371facced96463c2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to host a large number of links for malicious purposes, such as phishing or directing users to malware downloads. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

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 https://lbk-ingatlan.hu/uploads/file/kufopatifojaxinavufe.pdf In PDF document text
    • http://cpgny.com/userfiles/files/vonir.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/24184640748.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/52873565441.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/63275070770.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/24900834382.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/xamutowoko.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/bisiwo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76693042325.pdfIn PDF document text
    • https://bursac.net/userfiles/file/43148252470.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/43462631454.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/bovijoveg.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzovebodazuloditiwab.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/73443661508.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7bdc99a38e53d2c44b70cc5fa77895c5/88180420034.pdfIn PDF document text
    • http://splogservice.ru/content/file/rosudogadez.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131269371ccf---22380299965.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/vopudesitamunex.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lubonumik.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/67975999800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=myt+material+mp3+downloaderPDF 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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 10748 bytes
SHA-256: 5375c47e600317d75258d7be5efbdf6ab8794b6f2ade4c6312ef38bdca2fde0c
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 20636 bytes
SHA-256: e577ff09fdb9d35b27f9a0a4fc0c9f3b4e24da58d6f6fa6e58ce5af65bcc12de

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