Malicious PDF — malware analysis report

Static analysis result for SHA-256 582be9dfd26b8416…

MALICIOUS

PDF

299.2 KB Created: 2021-04-27 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6526f616c544533b5d73b50d59633bf SHA-1: 28742cc1830f1e6e41c7cbec03f100964971f724 SHA-256: 582be9dfd26b8416dc0c7bacec9d08cafcb250c95795cd6a73c47a303f185699
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'dafemum.ru', which is highly suspicious. The document body, though heavily obfuscated, contains text that appears to be a lure related to Dungeons & Dragons 5e. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dafemum.ru/strik?utm_term=dnd+5e+is+unearthed+arcana+official
    • http://fawaxifiwuzodil.scienceontheweb.net/meaning_of_self_esteem.pdf
    • https://cdn.sqhk.co/dagidomu/ZhfPZKL/communication_skills_test_questions_and_answers.pdf
    • https://cdn.sqhk.co/salobosemiv/dKgfjbd/30270808901.pdf
    • https://cdn.sqhk.co/todusukiraxi/QjjjhBf/4890826370.pdf
    • https://cdn.sqhk.co/wuzexesetaba/ewgcicH/69232115118.pdf
    • https://cdn.sqhk.co/kinuneba/haJhAOX/63609124996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b8577ce5-f9c6-45e4-828d-aedb40522815/why_is_my_dishwasher_not_draining_all_the_way.pdf
    • https://uploads.strikinglycdn.com/files/9fea2cbc-4128-4c1f-aaac-043932b58159/libro_cosmos_de_carl_sagan_gratis.pdf
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_0e920ae6e1d9484081b9959702ff9c90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/962d9406-6d17-4f61-b520-173d71cafa18/maze_runner_the_death_cure_trailer_4runner.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_89049558a2ef4463aa8fb49dbe143894.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_776217584d7544f9af40ed2800d89fea.pdf?index=true
    • http://pimimozoji.myartsonline.com/perimortem_cesarean_section.pdf
    • https://uploads.strikinglycdn.com/files/0cce4617-c8c0-41e3-8e89-cfbc63162c84/rixagogevumi.pdf
    • https://uploads.strikinglycdn.com/files/e6322531-5ca4-4507-bfc7-4e77b2d94b67/wonim.pdf
    • https://uploads.strikinglycdn.com/files/9a89df10-d308-42b7-a769-7f49ef490e4f/why_does_my_ge_front_load_washer_keep_pausing.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_b5ff92f8d4b7413f89fdee6834a2fdf9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6a8e126-f04d-4771-a070-ff2167a4193a/90498764117.pdf
    • https://uploads.strikinglycdn.com/files/edd395b0-689b-4086-b229-0d9c3fe3d4e3/wiwuk.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000454aa.bin
07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x454AA 3016 bytes
font_01_sfnt_off00045f65.bin
7d7ad3480bdf62156cc6c91c21e0a58137dfe2f616b0c90e5207c6b035733b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45F65 5232 bytes
font_02_sfnt_off00047137.bin
7d6d41d96aed5851773fa27b0156109f906b44a769b147ac93f09a40b15b6d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47137 13016 bytes

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