Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adedf6d7760bcd8…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 08:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8448fa7cc387b75507baa9c0d4693821 SHA-1: e899b41838d3419b71ee47df17a3ef24e0403405 SHA-256: 1adedf6d7760bcd8b45516f4195c6e66d413f6268af8014736cf1a3aea8c360a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://devison-matras.ru/upload/file/jalivoluraposanijew.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210925_4183062D32F6EA21.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/6537483365.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/29889063525.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/jezowexigosufu.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sunapuw.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/bugoduwunakubejoze.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/69663566952.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/35100797671.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/kunomagemipod.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/24275669134.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/gaxakeb.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/namurorata.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/webunokuxosaminowukoru.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/68169125430.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xubira.pdfIn PDF document text
    • https://riwg.in/userfiles/file/dilunurumitubosewiwepow.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/86065937450.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nijabozufevovujapepivumi.pdfIn PDF document text
    • http://pmke.cz/pictures/files/gudewujaxorakipifozerina.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e330fabe1d---kitogakulesifoviguvira.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210911_042658.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/18853679392.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/39836167309.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/faluxigitofojanotumop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=super+mario+world+cheats+snes9xPDF 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 14580 bytes
SHA-256: 2225917aa00a8b46d021d7a2c46287950e9dbab132be29f6743fbb6a985711dc
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 11308 bytes
SHA-256: 794bc1a09d0ebe67e27cd05dc7255350fe39e0665ead63b4ae51ebe11d056ed1