Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeae04f6b1cbfb40…

MALICIOUS

PDF

87.0 KB Created: 2021-03-25 11:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41dcb1cf70ae8cc67d827f90361457f6 SHA-1: b534fe49e1a87e4d775b68b8f4e42f7d1fbb54f8 SHA-256: aeae04f6b1cbfb409425dc06e35c937d7147c6fd4d25fb3b84e5d66056df2224
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to 'nipisod.ru', a domain with no known benign reputation. The document body, though heavily obfuscated, contains text related to 'bhajan songs' and application metadata, suggesting a lure. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=bhajan+songs+pdf
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fe0acc91bada.pdf
    • https://cdn-cms.f-static.net/uploads/4366637/normal_605300a01fae7.pdf
    • https://static.s123-cdn-static.com/uploads/4379359/normal_600695472a0b3.pdf
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fc9ab24916bc.pdf
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5fc96539e698c.pdf
    • https://cdn-cms.f-static.net/uploads/4467032/normal_601046874baed.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_601997f00de14.pdf
    • https://cdn.sqhk.co/pimepojuti/gdr6jaX/idle_car_racing_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5fdd77ffc9009.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6056f6a17dc25.pdf
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe5b76f2f682.pdf
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fe1d17f69490.pdf
    • https://cdn.sqhk.co/reretukida/R6gizEF/talking_angela_eyes_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4451044/normal_602452f1e587f.pdf
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5ff5ad0b9f810.pdf
    • https://cdn-cms.f-static.net/uploads/4485156/normal_5fe85d03d0524.pdf
    • https://cdn-cms.f-static.net/uploads/4476427/normal_604793dea3ae7.pdf
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fdfbfb76a228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vatosolikijike/kifezukusawutabujuzola.pdf
    • https://s3.amazonaws.com/najubu/big_data_analytics_definition.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/examples_of_nonconformity_in_songs.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_off000115c7.bin
641e3b22f631e0a0a525604887fcd6246d3138b618e6e1e64360e1a223a9c199
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 5300 bytes
font_01_sfnt_off000127dd.bin
98c999af8b7db025a4a414a562369d89cfd9f44d009f6edb9630aae522773a03
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 11516 bytes