Malicious PDF — malware analysis report

Static analysis result for SHA-256 56df77f8961e3fe9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 11:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebe607fef919d71268d1f0ec8d1d2925 SHA-1: 27ed2dd928ee800465f34a6be3f27aa2e6174d6a SHA-256: 56df77f8961e3fe9c2ae59b403d6ceb080acd070aabd8af2a84bcab9a043ddc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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 https://oniceh.ru/uplcv?utm_term=broken+android+data+recovery+mac PDF link annotation
    • http://twozonechickenlasvegas.com/uploads/files/38834084792.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/9179033894.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/garexadi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/ronibufoxakolajidalovanid.pdfIn PDF document text
    • http://planetamama.ru/files/file/57298633054.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/59232502617.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/nimudojezi.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xolikenazoxadaribasetitu.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/34075824368.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/jamoze.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/61807093114.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/645324385.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mixuvamuvakowi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910070309823547zdl13.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/35366726520.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92312906080.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/454afa91cb708ad9d43857ba0413540c/sogevezigewigel.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2572dffe---terilisivuxenejidukujoj.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/nazebenumat.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/27290409432.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/82664206319.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dajopewezesutafejim.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mologegexan.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/24665707499.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10644 bytes
SHA-256: 0292fa247a714cd0a743cad3c8dcb81cb57f07a6823805f4829c32915ae22f91
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 17100 bytes
SHA-256: 5c5d064e4cd32f10e76049d4a034b51e3dac9681b2e2f844c91a3fc6d5d6bc4e

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