Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a6c04d0b0d2be8…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 17:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1b7574120e183390c163f2741765cd6 SHA-1: aa7f7e2b4ad52d7bc0b8a032824ec8f04c8e3f65 SHA-256: a2a6c04d0b0d2be873100402ed70b010b1444346197e719780bcff3b0733a58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://archism.ru/uplcv?utm_term=android+mifare+classic+emulation PDF link annotation
    • https://granitabrasive.hu/editor_up/5832001682.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/zunenakivukokoxir.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/worugekojawoboporemako.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/78224395877.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lunimifibexikozifibosumi.pdfIn PDF document text
    • https://t2sc.me/userfiles/nufubipidoxekabibikegovav.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/16369216349.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/fedarakapimurub.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/varumotarefako.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54995406630.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/91829788196.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/dunefi.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/kosedexaz.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/31167744979.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/zavodumulunudo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f926fa4544b94e4bb3048fb7b855ea9d/norumozagew.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/tozawewozal.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/ronifumusewufexelu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/64434431763.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/77336148883.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/90085770336.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43880872970.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/waroniwimuvutug.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_off0000ad0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0C 15500 bytes
SHA-256: 7fd3dbac3bbcc80b42060d3ec343a56c285ed104b634163990163b24bc0dd398
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10716 bytes
SHA-256: f9f557db04eb491836607ef976b964af2ece376a98efa7d922ba8dc9efe10337

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