Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57efa33821bb22e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 18:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a15b3cdf3daf99b47525118f2060558 SHA-1: d187f2fba60a53c378ffc13336abf3d0c74129e8 SHA-256: d57efa33821bb22ea92f71d2156bf770e7ede786457e66049bdbb3c814bea1d0
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which appear to be part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt 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://queure.ru/uplcv?utm_term=lorena+alvarez+nightlights+pdf PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6dedda28---zujukamig.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/latut.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/50247493688.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gigakuzenosorewewavelez.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/gepozab.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/83205067189.pdfIn PDF document text
    • http://letdentalab.com/img/files/zijaderiwutix.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109072256479947.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/65400374088.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/zazukixixixadig.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/19826842281.pdfIn PDF document text
    • http://arucax.am/user_images/file/98094564571.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/71926293068.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/17394006666.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109082008419444.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tolupovinonamulamomij.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0f0cf87f2231601e96e8f7805c97eef7/mepovezefesenibokudoxewiw.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/19745195181.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908101755.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/venoxofulul.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xuvenuzapen.pdfIn PDF document text
    • http://manu-transport.com/documents/file/kusemutip.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/99317362195.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/43999585509.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 17892 bytes
SHA-256: eb089dcd62f8b3fefbdf20456be0f11bb1313c8066c606d073a9a2a09dcb1fd0
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10860 bytes
SHA-256: 869ce72d06d9184b86ffb77a15c1ed9af5018b20d0686d439b53424f26764a85

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