Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc36c12fc2a0ab39…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9664b207572bd046a5567b1f71ac5f3a SHA-1: c1ae557f29e1e7eb41ada58d7ace85e2f1b77d19 SHA-256: cc36c12fc2a0ab39c3ea2c1b02c70560789ef6e59833b621de5f962b346ede91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Numerous embedded URLs point to potentially malicious content, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and the link farm heuristic strongly indicate a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://styrexon.cz/userfiles/file/52583934946.pdf In PDF document text
    • http://meubelenindex.nl/images/uploads/10900975613.pdfIn PDF document text
    • http://landpas.pl/upload/file/diwev.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lelewuxebufuritokevaxo.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/sigimiwinupasexeve.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/36381920224.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gosujenasifigubaleserobin.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/buvegukuzemibozerokot.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/71219223718.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wofukus.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d40665---sexomopojobifamenivavebi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/fumovizagijewafejopumivif.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/58389601597.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/mirugisinijawuxabesemewev.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/vewobuvidisisuz.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45161783974.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/xugarewebejaxijesijis.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a1j9e4g849ccd48kj3fp499u/79536377480.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zewanofozodavajixamafara.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/lomes.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xonara.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jomibosuwavabizajajod.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xuwewore.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/11003747566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+deleted+photos+in+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/82869342477.pdfIn PDF document text
    • 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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 16072 bytes
SHA-256: 29db4497a98b88b607a082fc7148b0dd59dc0b014a49e5b3228008b4eb2263bc
font_01_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 10748 bytes
SHA-256: a66c3efc7ff960b78671351fffd48add501e5b950f2e18bdfb046b11af143fc9