Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e5f4e9031e2823…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 10:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7facdcb955eea4514edf001a8a11b07d SHA-1: d10d9bbe8d139e9471f9f08b681c418986097a3a SHA-256: b9e5f4e9031e2823b9b3d27c6093cc25f1bf575598316182dd3eb58d9891674f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

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://pixomot.ru/uplcv?utm_term=android+development+project+ideas PDF link annotation
    • http://zamaro.cz/images/fcke_files/file/fuwewedagin.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/14208380114.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/12243544092.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/zofogojojomagokogoxa.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/namazifefun.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/sipoposariwizivasa.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/30458153521.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/bebow.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/89746464015.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/koporewisoxipedisijodotaw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d40b69d11f19492d1b4b09e0fafd2a22/vumemidowumod.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109091931221985.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/pexazoxawawukitawuketelop.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109090010026982.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/rinoposenusefojelezipepi.pdfIn PDF document text
    • http://zubrcup.by/files/files/56271132538.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/waziduwojukumun.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/gitosuxexigepuvareperixo.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/73874019274.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/51346858235.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/23153463596.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161361be2c86b9---selanoserabawezopilur.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/58947512861.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/11916808622.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/54856212873.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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 17400 bytes
SHA-256: 6eb7ea86fb03d46c3ec4c63b17759018d1bf29416e04b8be49eb42d34bf350ac
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10852 bytes
SHA-256: 008c34effddf38c3f0b40c94fb8db0e72afc389e1ea18be3ea0cb275f154efe1
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1