Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ca733d985cfe22…

MALICIOUS

PDF

83.8 KB Created: 2021-10-06 02:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f98860f359fa9d869d7b2ad600279af6 SHA-1: 8b259182cc31824cb316a214580da0f752e653b9 SHA-256: 40ca733d985cfe22c1e6658e98023b02811ea806e0151239329e75304548e3eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=madison+beer+sexy
    • http://stilistspb.online/public/files/uploads/files/37605472077.pdf
    • http://kerrya.com/ckfinder/userfiles/files/wafitusajawotuketom.pdf
    • https://rizecanreklam.com/images/file/8176950562.pdf
    • https://rireenfrance.com/images/upload/files/xerukutezuxirireso.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/dijoxilidomisisaxim.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pexalefakisorisudu.pdf
    • http://e-park.es/img/uploads/files/25989214388.pdf
    • https://qcbusa.barettis.com/userfiles/file/kugeresarajevurekutezez.pdf
    • http://staropolski.net/Upload/file/94918524707.pdf
    • http://tsutae-f.com/js/upload/files/gidiketolixodadalaru.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c0d53b5e827b3b8299623df1646fa7b8/susefuramapivagewir.pdf
    • http://imreelectric.sk/uploads/file/kajefiliwifusoguxubaboj.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/36788490239.pdf
    • http://aytekinpolatel.com/image/files/41731027572.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/xaxofoxadumugemapijive.pdf
    • http://singlesync.com/userfiles/file/23180109478.pdf
    • https://breedlife.com/upload/files/21724709644.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/36833844601.pdf
    • http://mebelhotel.ru/userfiles/files/39248382804.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/48125563240.pdf
    • http://ventima.ru/userfiles/file/38358109080.pdf
    • http://jfe.hk/userfiles/93182497331.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df03.bin
a752f6b82fae14bd99e5c3321a5e855c3c6d9b8c0b38118174abfae3d69a9a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 10448 bytes
font_01_sfnt_off0000f6d0.bin
b4e13db3724f39962b5ea0a2e4c4a92be2b36c659c439652fbe8ba86f40121b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 19168 bytes
font_02_sfnt_off0001289e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes

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