Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc56c12ac8b6d2d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 09:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7ef7fcbb5b2b25abb5f423b99886f3b SHA-1: 7673b6c885da1a375829d134dfc83d70b7e13149 SHA-256: 0dc56c12ac8b6d2d3d40cdebaa9b8c1e72aefbe5caf923582de4b88b417adf17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, presenting numerous external URLs and a deceptive download button. The presence of embedded URLs and the overall structure suggest it is designed to trick users into downloading further malicious content, likely through a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=textfree+download+apk PDF link annotation
    • https://baatco.com/ckfinder/userfiles/files/97213294855.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/wazejunusozuraxelu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/jezixobanufekufolisikiko.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jopitibasikarolokom.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/24476835761.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/waneganujobane.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/64038445687.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/radisog.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/daxowezemugadelufeledi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/xotegazisogojunot.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zivosumajax.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_4CE1D7FE8B40B71D.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315fb5276d8---71783839541.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/lavelarikeluziwosovamexiv.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/96772303590.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/34725844683.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911012345.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341a771e0---8719609427.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/35859808865.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/93751360297.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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 18208 bytes
SHA-256: cd8ce7a6d18f45a8b66812682f6549fc57638a7e1f4d419b518da2daf2845c87
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 10476 bytes
SHA-256: 59c7720b5edb3168b3f942ebba0c43bbcf2ea89b1b9edad9c1f3f0b51f4fd00a

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