Malicious PDF — malware analysis report

Static analysis result for SHA-256 d134fdf2d2140da3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 06:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95a53f67dcd7456d07f2e2c79bd6f1ac SHA-1: 766a7885b8d684fc593e277eadbc357d33b5485b SHA-256: d134fdf2d2140da3f983770e16edaaddc6584db917157cf6faa5a68cc8f95ed3
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to academic content.

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://mezovuduw.ru/award?keyword=bsc+syllabus+chemistry+pdf
    • http://jijabewifomemab.iblogger.org/femonepulitunidesowut.pdf
    • http://wegoradubi.sportsontheweb.net/tipos_de_abandono_infantil.pdf
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/subikopuvos.pdf
    • http://defokozixeral.sportsontheweb.net/84423492104.pdf
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/3198f039410.pdf
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/8c7c29.pdf
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/bozab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/goveruduzewoxu/how_to_use_chicago_style_in_word.pdf
    • http://piwakitidi.onlinewebshop.net/wuvazarevijaselinaxeraba.pdf
    • https://s3.amazonaws.com/dinigugaxej/numubotovino.pdf
    • http://redebalumu.rf.gd/wezeninatenewanimokula.pdf
    • https://uploads.strikinglycdn.com/files/c6496ae7-445c-4698-be8f-5d099d7c81bf/is_the_acsm_exam_hard.pdf
    • http://gekolutewubel.myartsonline.com/coloring_bible_stories.pdf
    • http://kugugoroxe.rf.gd/student_internship_cv_template.pdf
    • https://uploads.strikinglycdn.com/files/865fa72f-eb4b-4c39-8d93-412f58d13398/tecumseh_hm80_carb_settings.pdf
    • https://uploads.strikinglycdn.com/files/f0599ce3-328d-4dce-a96d-b83b9e22f1a5/how_to_set_up_presonus_audiobox_itwo.pdf
    • http://sizemogigu.myartsonline.com/excel_formulas_list.pdf
    • https://uploads.strikinglycdn.com/files/e6a62a24-0f24-4529-91d1-a9b3af121da1/buzagejawulufote.pdf
    • https://uploads.strikinglycdn.com/files/cb571d69-964c-401d-8b65-db019f9011f4/romeo_and_juliet_act_2_scene_1-4_summary.pdf
    • http://fajenadiwizowo.atwebpages.com/what_is_a_complete_subject_and_predicate.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f605.bin
35600388ac70d9f37b9ee133540bad6b399dbb39c172c982c34511d467074478
pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5688 bytes
font_01_sfnt_off00010931.bin
9eaa263e6cd6c51ee071e98cc16523498f18f8afd6b07ce38bb6cbd94536c615
pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10716 bytes