Malicious PDF — malware analysis report

Static analysis result for SHA-256 15367c3ca4bc4638…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 05:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0306e21e377a0c70303a37fb45e6cb2e SHA-1: c25854928c5ebbeeb699af63dbb57d9963fc679c SHA-256: 15367c3ca4bc4638390675cd5a6e9eac9283a81a036ea037b255f283292cf62b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://ketchas.ru/uplcv?utm_term=blade+runner+android+test PDF link annotation
    • http://ciaomamma.hu/editor_up/71567882087.pdfIn PDF document text
    • http://kaies.net/upfiles/file/19908272447.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/41925768892.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47b7684ee---97028905118.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/fewuwamizedivu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/lonanofotumugefo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bab972386---74329026598.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/gararet.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/12253797503.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/mabobowi.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/56532729620.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/89135320371.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/guferobudebukutamusetis.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/girex.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/24755252091.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210906094613_gsd8rc.pdfIn PDF document text
    • http://cabini.it/userfiles/files/sunimefiw.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/woletigiraliwugugajog.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zifaxunawirezubutevu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/71734016954.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/80806610498.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/92825594950.pdfIn PDF document text
    • https://andhimazhai.com/images/files/nuputapukuder.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/9538063554.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_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 10396 bytes
SHA-256: ca72e485cb4f8cc1fc27df74eafaab3652398971ab31cfea10b8e1f0b5f1563f
font_01_sfnt_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 14928 bytes
SHA-256: 70cf22f27151ad7cd798cca39fd8285243b7db21d510d8286f7b3db8764aacc6
font_02_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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