Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34fc08292c42071…

MALICIOUS

PDF

93.2 KB Created: 2021-10-12 11:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ebdaab3552856f7b606f610c1fea9940 SHA-1: 573d514aaee05a7092ce6964420a09d8191cf694 SHA-256: f34fc08292c42071b6cda44159ddd10788c940a5fae50f1da5cd85bfa5cbd0b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ultrabeauty-ff.ru/userfiles/file/bidiguwomifiwev.pdf In PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/49012335179.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/xefeseritoriviwigagabiva.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/94de7c3184c77d5cb7c3b3feb3f5c781/narevuzim.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/zaxutobam.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/14266617944.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6a96dad8---52101864785.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/givasimorapupepab.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/32456637818.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/foxudofikuwupoputatir.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/2899777158.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/darijexutokaj.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/90377673061.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/21979585503.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/josukisep.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/polerirabapu.pdfIn PDF document text
    • https://atlantidegattico.it/file/2612527213.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16160a382626d7---muxetixenikekobiwevasoti.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/wugujarurakase.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75982364353.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/safubexenafidupawiv.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=javascript+check+if+is+stringPDF 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_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10740 bytes
SHA-256: 99ee17c38179613d4875fa49a1116d654e76b85ffce977f74ebe7e335d48310c
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 20064 bytes
SHA-256: 19907aa43bed80230510f42df7989a1bb03ad2660315a057cb1e6e0888e798b9

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