Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e39da5b089ce3da…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 02:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 891b3c093384843dc77274b942882eb0 SHA-1: f77290d1021b2a5e7ba308c8e2c93c727f0be8ab SHA-256: 9e39da5b089ce3da1e45972c327e93e5fd8b5caf05ad9b7e848f4b66312d19c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=ppsspp+android+system+requirements PDF link annotation
    • https://arnetbilgisayar.com/upload/ckfinder/files/45988020191.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/63145937248.pdfIn PDF document text
    • http://domplus.su/userfiles/files/gajibufukokuzenezolaxu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/pagesirenam.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/samitewasagoxapubade.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/julonetomakotazigorurade.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vumujorunonufubawirakopot.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/38445148114.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/31971597086.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/jofesugidepivuwogusir.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/83118544968.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f4154e174aa57d9c3049756ab5569d0b/91514673988.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/vitufefesosenil.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/nizofipizoro.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/30212713572.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/gojupajegumugixumurufawar.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/33425389585.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/76578133638.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/nesimixer.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090613051247.pdfIn PDF document text
    • http://idevoz.rs/files/dogesasufinasisurufe.pdfIn PDF document text
    • https://windsbs.biz/files/file/54701476436.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/72344298294.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vawobujod.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40136467008.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10868 bytes
SHA-256: 097178284c1269d4689e4cd6c898f246694d4c2225c945c0c64f5bf4d75b2441
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 18200 bytes
SHA-256: 448c0352d5691e57a0994e8569dc659e31a2f6974cf604a9f41cc93fa3eea21e