Malicious PDF — malware analysis report

Static analysis result for SHA-256 023fd541954f4cf7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 03:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 447badbf14f664441a9c4c64316c501d SHA-1: 2d15a67af53621457853c97ddc0ca63f4fb1ef53 SHA-256: 023fd541954f4cf79838a3bf1f8b0f8d9f2da5d856e405424f77a0ee1abae12f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The numerous external URIs, many hosted on potentially disposable domains, suggest a link farm or phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lafiestadelmoto.cz/files/file/zebunexoru.pdf In PDF document text
    • https://manenshop.com/upload/files/84323381438.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/kebeji.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/14379710058.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/8209734907.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/xoduwibazav.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63062352710.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/42745081954.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff21b49ad9---65249646778.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kemurajefik.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fapobekinasubawumafa.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/98449356196.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/12755821716.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/jitijarujulegukunewukak.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///66779314386.pdfIn PDF document text
    • https://shidoremicrosys.com/media/visosabokonezusekix.pdfIn PDF document text
    • http://mastervin.ru/files/file/23604059363.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/89178276386.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/nanotojedaparo.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/29157352856.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/22627222809.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/54807386788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=marshmallow+os+versionPDF 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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 19244 bytes
SHA-256: 606930e1caec53b414babc2956f904c0090ae816d8180ddfe610f7d55aa3194e
font_01_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 10420 bytes
SHA-256: 3735526a7b8453318db7ea2b19628a005e7433df9f3784edf1476f414749c8e5
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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