Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f2fa6feca1b3f1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 06:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06517ee6425b6e098622e732bf3d0663 SHA-1: 052e3f499d92fcc3be753cd6c2c47a14a9a97901 SHA-256: f5f2fa6feca1b3f162d500735ffff3d5efa089c525b2a466da1f2bcb50d1a6db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://studiotecnicopetrillo.eu/userfiles/files/vosolugonemedesikak.pdf In PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/moxovijux.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxufuvamaxu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/51377348939.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/52605384978.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fepifobos.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/56872604566.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389bf88489a---86657742619.pdfIn PDF document text
    • http://agrion.org/upload/fichier/1952885426.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/tapalimopirif.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/33c5bff86ef5f3c84119b4022242685e/66075524291.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/78330504741.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/1006678003.pdfIn PDF document text
    • https://majubesar.net/contents/files/betaxedikerajotife.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/9131079559.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rimosotolavudanax.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bipojuta.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/8896143589.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/33718475764.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/71261600523.pdfIn PDF document text
    • https://gameclub.by/uploads/files/suvamiginebabekabaraxa.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915123430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=poison+ivy+3+full+movie+123moviesPDF link annotation
    • 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 17220 bytes
SHA-256: d931a672827bb051fdeff8ef5a1dde55b461ea0ed748684d0fdf1dd9102961d8
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10640 bytes
SHA-256: dea2b50cca6beaae54dd60cf90723c1318e0aef9ee85c40beaaf631f773650a0
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1