Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5896a4c7268c31…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 01:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42fd525c81d2b019b82336646239be5f SHA-1: 5ae430bfb0725e302f160bfed7309ff84b23555e SHA-256: 7a5896a4c7268c31d6e6263c915e978283857d8c2c3c8ef7d87865cfa1dd9516
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 URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=monster+legends+mod+unlimited+everything PDF link annotation
    • https://macroedunet.com/userfiles/file/kusajavenil.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/86355296184.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/sopil.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/xukereretofijusujugosu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/973f4ce50f786f6369633c83e9aa53fc/41263281404.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/10301545942.pdfIn PDF document text
    • http://mlight.cz/archiv/file/fasurivafobowobutum.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/bunukutaxo.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/11709038003.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/70174325842.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/42656570409.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/lalosuwedozemovadudezew.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/70324417637.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • http://marymo.ru/uploads/files/82639506385.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/90524376080.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xifopesasem.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/xagulezuvasezuga.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/36022219046.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/mejibusivuvutaxo.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bojisiwivaneleme.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/34517174109.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/robiva.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/watajulob.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/26692729747.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10808 bytes
SHA-256: 3577c1bdcd9d2d51356ed8fc908e537ee71e30506e7f0e5fb8d2a067bd01397f
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 19928 bytes
SHA-256: 4b2ad0045c4886f6ecb2623c7bc1a2d698fefd0203b266b21ea17f5d5d8258cc