Malicious PDF — malware analysis report

Static analysis result for SHA-256 72eb5f468fa26df3…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 01:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 855f54ef3072ce07f901e9e7eb22edbf SHA-1: 40fa9caf81ad3a0ed61a7794566dd5b2b71181e1 SHA-256: 72eb5f468fa26df3fee66cb2060288025b29d870f1ef7855869ebe15ac41640c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=a+sample+prince2+project+pdf PDF link annotation
    • http://hnfhdc.com/UpLoadFile/2021091209205633293.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/34009139025.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/digavigijuvuwugo.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/zejekupevetutiw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b437d1d81e760c48b04edc9db8c94408/wududirevupesuleti.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/24120811969.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/4888781165.pdfIn PDF document text
    • http://sieuthibds.net/images/files/gikevozomerifavagepulupon.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092510000073499.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/nesabeb.pdfIn PDF document text
    • https://citytrafik.nu/images/file/97333315762.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/nifopo.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/gosibinimike.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/22152736869.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/benivitovodinovaxokiko.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/77546352968.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/90584594916.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/mujasuz.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/92686146415.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16030795013.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/tebunu.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/vipolemoke.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/15642396159.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/50481826625.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_off0000b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21C 16740 bytes
SHA-256: 6ff51d21df302dd6a710e63708fed767e15b5b23f3e98f960f2cec21d763ff4a
font_01_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 11012 bytes
SHA-256: 7e720ab5753a752a39475ae935a172e4df3abda6b9e45d0bb8e3aa0d984bd972

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