Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a022c14afb9013…

MALICIOUS

PDF

83.1 KB Created: 2021-04-07 02:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263a3f647100a592d08a7ee343e102db SHA-1: d427ac19ad08af4804ba61c088055bb6618d4bb9 SHA-256: 45a022c14afb9013c9bf28a0bd5431f058319e2a616ae6e410d515240342bcfa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by heuristics as PDF_URI and EMBEDDED_URL. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=tibialis+anterior+stretches+pdf
    • https://tosixugiza.weebly.com/uploads/1/3/6/0/136052785/33868d16a07aef3.pdf
    • https://nodeseverew.weebly.com/uploads/1/3/5/3/135323512/ropuxo_nexeg_mujawukixixoza.pdf
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc7184c4777d.pdf
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/4572419d366b7e.pdf
    • https://lowalijadu.weebly.com/uploads/1/3/4/8/134866304/vikaxajitipot.pdf
    • http://witikotuxigere.scienceontheweb.net/xoxebuduwowapaxisuv.pdf
    • https://cdn-cms.f-static.net/uploads/4426695/normal_6041604dce6d4.pdf
    • http://sarawavenudiwap.mygamesonline.org/xurazalusukenaziv.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_602cb571711b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelikubapiwaj/13049203354.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_f34b6b2b77b74a9f9a997a3f35af31d8.pdf?index=true
    • https://s3.amazonaws.com/jenisozazewubo/77258111054.pdf
    • https://uploads.strikinglycdn.com/files/ddc4392b-1c9d-4de4-b771-b608b95e9975/xuwijoforikevigigu.pdf
    • https://uploads.strikinglycdn.com/files/75f0a6f7-98db-4e00-9882-77d3b87751ed/how_to_add_zotero_to_word.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_e63ad28634714e3e83f6daddf5d98c8f.pdf?index=true
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_bbcdc160c9924a66a9eef7b1f2c72d5d.pdf?index=true
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_f46fae3b5e0d4bc391d6ac053cacfd0c.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_e864f8291baf41bf852c2b9b03f67f77.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ca.bin
81b113fdc25bba72dfdcd1a8c2f889250c93eb22c3a256ec15ea6802d33d7236
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 5332 bytes
font_01_sfnt_off000118da.bin
22bb32633016d0a4cb16335ce3f3ca6dd56c1b802209887773c8c8c1484570f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 11172 bytes