Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f20e69405d6801…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 12:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 6677da9b38a063fb9ba8dfd0cfd7f8ff SHA-1: 4be901a61d1c9a4b3d6bfe276a66213e16c01bc6 SHA-256: 21f20e69405d6801ada4c1359d5de7567bc1ae85ea7c0a0c087bf038b71f39bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://droprint.my/home/ququ4923/public_html/userfiles/file/zajefusagovuvetizabifab.pdf In PDF document text
    • http://pibar.tw/uploads/files/202109021001325246.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/juwinipusaxuzurobuk.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/fozejewaxu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/82065601702.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/dejovokavax.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/vaxog.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/78897934967.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/37691279161.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/15033150678.pdfIn PDF document text
    • https://kaimano.it/file/21554726176.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/76175012446.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/16683671263.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66125630283.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/17153689096.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/16682098551.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nanokede.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613850975ca15---62003839524.pdfIn PDF document text
    • http://123dvere.sk/files/file/dedixifowewetiliwotetewi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/309c29257cddd7fcba55de2fe0d861c2/tunefomulotovabemeta.pdfIn PDF document text
    • http://espwireless.net/uploads/file/pubowiwibenadufenuten.pdfIn PDF document text
    • https://inarsindbari.org/uploads/94195736657.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/64040302937.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/egqvdee54vplf2rbolg40e8j61/1120664521.pdfIn PDF document text
    • http://patroha.hu/file/26853150004.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28076901268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+android+%C3%BCcretsiz+indirPDF 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 18256 bytes
SHA-256: fe7bcee77cb42d7fd12f8d9579a7b93d12612a1699f925405ead3b1cf94da1d9
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 10668 bytes
SHA-256: db892e83bbf684b206fc7015a8150c00b3f96d8b4285168ed7aa9695795ab045
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1