Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa635f57fbbf18b7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 16:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98fb58214c34ff19609b2a1505396e7 SHA-1: 55928aee2897135896d8b68fece5fcb26e6cd19d SHA-256: fa635f57fbbf18b76d90bfb2d803adc5a5fe27251d20201f93569ef216af0dc6
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of an embedded URI pointing to 'mezovuduw.ru' suggests an attempt to redirect the user to a potentially harmful website. The document body, though heavily obfuscated, contains keywords related to 'Catholic daily mass readings 2020 pdf' and authoring information from 'wkhtmltopdf', indicating a lure to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=catholic+daily+mass+readings+2020+pdf
    • http://unityfree.xyz/417546895417klol.pdf
    • https://cdn-cms.f-static.net/uploads/4372076/normal_602e623b6ac39.pdf
    • http://prequester.online/advanced_english_cambridge_bookygzpo.pdf
    • http://nepifenimet.iblogger.org/satyanarayana_biochemistry_5th_edition.pdf
    • http://yewes.space/the_human_condition_hannah_arendt_chapter_1_summary6hkan.pdf
    • http://4escam-bot.online/best_urdu_romantic_novels_2020vw9v4.pdf
    • http://help-bluebadgecustomer.com/58658568213vacfi.pdf
    • https://cdn-cms.f-static.net/uploads/4414175/normal_602ff3a57a29d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/708ab398-3d7e-4c62-9a0f-96e8d0131319/kasowirufavo.pdf
    • http://wufajin.rf.gd/tawagarefe.pdf
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_99ee42b7c15144159445079285e121b4.pdf?index=true
    • http://favekagopu.epizy.com/mamosukow.pdf
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_dec6190665144902995a10bf4bec28eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a3b72d7-f0ec-456a-be18-ca628931dbbe/how_to_write_my_professional_accomplishments.pdf
    • http://wubazinosimisod.rf.gd/sunosejuzavi.pdf
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_bce14bce1d6e442985e927f139890b90.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_2b08384d5f3242f482d452859516376c.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_off0000ef3c.bin
b1ce16ffe11499c5268cb7b42b5cb8ba26a845a234c0f6743a92f64058729848
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5848 bytes
font_01_sfnt_off00010301.bin
3257e7969f94e28acfe91324e3abbf2affad777d23afec5f1df028a0ae3fe1a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 11776 bytes