Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93d8ac7c4394f21…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f93464c4e7345760599d658c871db978 SHA-1: 51fbd5f6af9e1ba082930783848e622aeb09bf61 SHA-256: d93d8ac7c4394f21bde0ab7069223f9bf3dd0d9eedfb56aba97d54961ec06494
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI findings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://smidgel.ru/uplcv?utm_term=how+to+bar+calls+on+android PDF link annotation
    • http://clairvoyantinfotech.com/demo/images/44485045940.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/sapejupedix.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdfIn PDF document text
    • http://tzsunup.com/upload/sadad.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/48344106507.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210921094326.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/lulowu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c6c773a3---kavebabekobadagopikasera.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pakosunoxu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/vafigilam.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/53209516199.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/fugidetesojezike.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zefomino.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/47300827975.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ceff01b9050586f213a297c6f05259d2/zopapurotuminurebifazodow.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/53161978934.pdfIn PDF document text
    • http://email-database.info/userfiles/file/38105298908.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/26527974952.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/76170248871.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/xirexejowuvuw.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/tufalavewerudadepage.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/75680772412.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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 16408 bytes
SHA-256: ee1dda8c58c4a73acf0beaec491e18024c2e07785f3a87486e5e02f3d01e684f
font_01_sfnt_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10448 bytes
SHA-256: df626b4dde8863d94ac0d95a0dbafd95620ce79c4a306ac35fd72e619ff17ad1
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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