Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd95668d32a5b9b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 08:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f579f48d163aa864448e32e64aad40f SHA-1: 20f84a2431b12c1f3c7f179e3f7ed34be5e6529c SHA-256: 2bd95668d32a5b9bc0651564cbc1dbe03ea333b70c22f17d1e7b7fded052415a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking. Multiple heuristics indicate it functions as a link farm hosted on disposable domains, aiming to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d58e7d842c---toxutejavemubid.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd92caa62---99912266849.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/pemeko.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/pukalogaxiwed.pdfIn PDF document text
    • http://chromavials.com/d/files/zavebuwerijazomavinaxu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/18675215198.pdfIn PDF document text
    • https://majubesar.com/contents/files/35144970521.pdfIn PDF document text
    • https://casaalu.com/luutru/files/22590777929.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/31772723613.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/74338815213.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/petiledijegivuzubemis.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/29431972770.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72853256776.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vasokinuril.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kuxagupajowupaxag.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vebopekimutam.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/wukupotujogoxotijoniz.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/35312344482.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/wuvidileraxivuzabed.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/62012268187.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/54179548669.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/nidagejiwuxakonotobe.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/30548411974.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/12807160120.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/12940126417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+difference+between+iphone+and+androidPDF 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_off0000b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 10892 bytes
SHA-256: 0402333b1a93304d27cc178495e49a53bd182562029e72db10bc612272a3f5a8
font_02_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 14148 bytes
SHA-256: e0165b963cc9446f0870bb69fc690698e4c02f8287245291ad060a0cc12779ce