Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b51232924d980c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 07:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bad6440cdeb084172a08ff41d38a6af8 SHA-1: 92248e53c58d06c54926b8ef45e469be1de413f1 SHA-256: c5b51232924d980cf537917400aa6030c8f46a2807b24540d7043a94e887f445
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://pixomot.ru/uplcv?utm_term=tubidy+free+music+download+for+android+tablet PDF link annotation
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/21882178067.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/vanoro.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161534a61a87c4---vojuwibejinivaf.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/80628763219.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/fefusenasep.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/24579361044.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/tepira.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/tazanupekomigojusawig.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/sarafi.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/62143202903.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jikukukuxerukub.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/85287545487.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/75380773697.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/giwodugu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c8bc2c6d---bovivaxowe.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/95804486292.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/rivaremubuvefaverananobu.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/fedavatokajetanug.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/98819882882.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/megenitigawow.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tatotogedixawemoz.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/72608569805.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53a79daad---fejadudomelos.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_off0000ad97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 11040 bytes
SHA-256: 65e6b0b53aa0020585fb100bbe1668441a25a07a7fe23c5623d78f7454393caa
font_02_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 15072 bytes
SHA-256: 895718e8eba87a4b1e66d3c9c43735f6de51ec26538712d599523e2e90255ebb