Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e81d9761f9f7b2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 23:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79032cda0c815e1857d8670160348821 SHA-1: 178d0333ae44cb36e1876e310d1b8e396d272370 SHA-256: 69e81d9761f9f7b2c72a0320e096cb0e6918e9a7a0935dbd8387ebbd71b43741
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=the+old+guard+movie+free+online', likely serve as lures to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=the+old+guard+movie+free+online PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eb8fa0489c7ec0704a191d219e07c69b/33563422838.pdfIn PDF document text
    • http://riph.pl/userfiles/file/27413846774.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/sumatutejeren.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369139644cd---97705655196.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219121826501275.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/semokigifep.pdfIn PDF document text
    • https://atavio.ru/files/file/53687179911.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/bekogar.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/96551013214.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/68254047551.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/45968714339.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/nipufibetuzubudokejiv.pdfIn PDF document text
    • http://www.siposferenc.hu/html/tabozozelodofotiwa.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/9879221525.pdfIn PDF document text
    • http://yoron.net/up/files/jabefetomigotowitebitew.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jadugeve.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/52559111658.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/15856732716.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/13906102603.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/denetepexigijisesejifupe.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/jugovamajikijir.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/24114656404.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/45904493580.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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 10664 bytes
SHA-256: a889437d782f86b4b0c24a5bf72febc007a7d00f2a3da87e0598a7f0681ad0e2
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 17272 bytes
SHA-256: e4fc1b131089033090d41fe9adafbd259f2250003e4abf964dfe512fc2772f99
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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