Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bed53b0fd476ee…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 22:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07db2bc1fdb0861484db2da9a27c478f SHA-1: 1c1466e9a240e73d70e3567298b62232af7e1dbe SHA-256: 77bed53b0fd476ee7f08d7b510d1c426497f82d20063cfdde68c11ced5b68aca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://landi-bg.com/images/file/zerujelelozoxedese.pdf In PDF document text
    • http://word.mn/uploads/assets/rekunisavasuzu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/wexuwowawikizix.pdfIn PDF document text
    • http://jar-ted.pl/file/93964009980.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed4d04a6---jetenore.pdfIn PDF document text
    • http://ceroki.com/image/files/5102095841.pdfIn PDF document text
    • http://wsm.hk/images/files/mijalamebevogotopagur.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_C68A871BD36D9641.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/jiniwigu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jozuxitozobukate.pdfIn PDF document text
    • http://kahasat.cz/data/file/67224238641.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/rafifolorunigizevin.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139c522374b0---zopetiwiwigeretineranekaf.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/79800167508.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/61436015420.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/30120019325.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/67621108371.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/10938421466.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/mivurenagukabegumure.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/85669694886.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/86826999627.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/mofalepotug.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/77704756392.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/kezer.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109020636457437.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/gobumunoretetamegapiri.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/98299021823.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/42615054034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=visible+light+wavelength+range+in+nmPDF 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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 15248 bytes
SHA-256: 2f4e192e43b446177eb4a133c072b22da7a597dd83fca2802902cd1ad5bff622
font_02_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10696 bytes
SHA-256: a210dea7086dc12ab5ee25c6a4fd76197dc2993a03c32ef338a3d3cd3b1b8bd5