Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc107fd15f9231d1…

MALICIOUS

PDF

95.1 KB Created: 2021-10-05 20:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1732279e4edcdea795c91b993194e139 SHA-1: 324506d47f09775c82ea40ebbda0b8489bf6d004 SHA-256: bc107fd15f9231d139d32e67f7c1e3c7b687cc6b5b1ce30b386618a4752e5906
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nirkongrp.com/ckfinder/userfiles/files/nodazurebamevewubof.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1615afea28a1f3---99376477590.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/29486594430.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c1394f7f5eb50d6d3947214ec5fde18d/80180435222.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/50029929963.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/1859536385.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/nuvufuvopubunudenoza.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/vedidezakasan.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/powijularegejewekupolovo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wadiriraribavux.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/tubuperozuxanulamilorofor.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tipuvi.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/serebuxosew.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/sakumoruxulul.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906225939.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/lemokuzevozefajugepawe.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/jinuwipixej.pdfIn PDF document text
    • http://mobiliteit.nu/files/2336855083.pdfIn PDF document text
    • https://zzhqhi.com/d/files/28440508727.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210917_110097185E523E4E.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vazuzijirurosupaj.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wogagosesaseronowamewovol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=anxiety+induced+psychosisPDF 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_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 18856 bytes
SHA-256: 621f46d1a94ff74d2ec4816d47b4d8d0dffb1c431a74b90981804468e34e5b10
font_01_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001568e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568E 10600 bytes
SHA-256: 23b8c2d2f684f21efd357187b8f58949f07b929d9b75508459f9a726b13d6411

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