Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4479a9c1f7e23a2…

MALICIOUS

PDF

240.5 KB Created: 2021-04-01 14:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf28061f2bcd1904bc666542e3890efe SHA-1: 7f2fbde751959d78a536c4c5a90fec184ba73c9b SHA-256: f4479a9c1f7e23a2e82a4c64c55bd6f3b3cc7a95bbd86e5d875dbeaa152b0953
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 'https://dafemum.ru/strik', which is likely the destination for a phishing attempt or malware download. The document body, though heavily obfuscated, contains text related to 'World of darkness merits and flaws list', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dafemum.ru/strik?utm_term=world+of+darkness+merits+and+flaws+list
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6023f4d0b0e70.pdf
    • https://cdn-cms.f-static.net/uploads/4408462/normal_60622b2a759b4.pdf
    • https://cdn-cms.f-static.net/uploads/4416304/normal_6047a6e1313d1.pdf
    • http://freds.space/pokemon_sword_and_shield_strategy_guide_bookh5112.pdf
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/zesataxejej_kupizefajat_tovixawavulof.pdf
    • http://dnepr24.info/girl_online_freert4g2.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/muvujetemuxoxiwes.pdf
    • https://static.s123-cdn-static.com/uploads/4402938/normal_5fcc7a0e4b113.pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_605079c29c53d.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/745c48481.pdf
    • https://cdn-cms.f-static.net/uploads/4415081/normal_60634bb35f7c6.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_6022c0b0ed5d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65e4ee27-4eb3-4869-8f79-cf47fd9d0ea8/mazikukulagalitovipuzo.pdf
    • https://uploads.strikinglycdn.com/files/4f2935c7-8ad0-4bfb-b35d-69f074715414/jakebale.pdf
    • https://uploads.strikinglycdn.com/files/c1ad1a70-7fa4-47e8-a75a-5ef59ab9785a/dilejigikuberubumu.pdf
    • https://uploads.strikinglycdn.com/files/67c570af-d3e6-40bb-8fe6-eee4f11ff939/around_the_world_in_80_days_2004_full_movie_putlockers.pdf
    • https://uploads.strikinglycdn.com/files/a7ec760f-db97-43d9-a825-cf2af11fc6f5/how_accurate_is_omron_fat_loss_monitor.pdf
    • https://uploads.strikinglycdn.com/files/b3d362ef-566c-4742-af57-a925f7dbc8be/43933859482.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_off00037c0e.bin
4c842ae2b0e8622f3fc5abb8b2c76cb5ad9bd4064e09164c21f1ff8d1784bddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x37C0E 5220 bytes
font_01_sfnt_off00038dd1.bin
ac89443d7ff9a7a5620a5f7e77c00b9b325abf984c3551573ac4ddeafb7e1191
pdf-font-stream PDF embedded font (sfnt) at offset 0x38DD1 11188 bytes