Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f70eb0b1fab97c3…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 10:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e123ff705c5f69535f7db41e4a89eab7 SHA-1: 6ac7e8b840930e58e731b878695647fae60221e5 SHA-256: 9f70eb0b1fab97c3da325a953246f871d10c1d5a1de7c2b04349a67c518b80aa
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document body, though heavily obfuscated, contains references to "piano sheet pdf" and a URL that appears to be a lure for downloading a PDF. The presence of an external URI points to the document's intent to redirect the user to a malicious resource.

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://lozipotod.ru/123?utm_term=glassy+sky+piano+sheet+pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd96dc8a86a7.pdf
    • http://simcars.ru/kalyani_publishers_financial_accounting_solutionskbwus.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • https://cdn.sqhk.co/xaxovowupofa/jjgj8Bv/koxudexerula.pdf
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/vuwis.pdf
    • http://korecos.ru/lotemocoop6.pdf
    • https://cdn-cms.f-static.net/uploads/4403117/normal_5fe84a066a8b4.pdf
    • https://cdn.sqhk.co/zefipuvuwifi/jhgsghT/glow_in_the_dark_party_invitations_templates.pdf
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5ff253d452f55.pdf
    • https://cdn-cms.f-static.net/uploads/4486061/normal_6045fd2c46ccb.pdf
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/bovabiki.pdf
    • http://repair-telefonov.ru/25277411435nxpkb.pdf
    • https://cdn-cms.f-static.net/uploads/4413113/normal_6032017827159.pdf
    • https://static.s123-cdn-static.com/uploads/4424953/normal_600219bf8877c.pdf
    • http://vostokzapad.su/kobalt_portable_air_compressor_manualfht5t.pdf
    • https://cdn.sqhk.co/weretesa/hcjanIa/dajoruwekerojivop.pdf
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6035a240c460b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fibejebovef.epizy.com/98648334194.pdf
    • http://leduvusiluvev.rf.gd/tekobimasoboradijanuvu.pdf
    • http://kapigazezej.epizy.com/microsoft_sql_server_guide.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_off0000f42e.bin
8cd5acd7ab3e1aa9da1dcfbbdb645358cb641581f9dfd167127d488655f879d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5228 bytes
font_01_sfnt_off0001060b.bin
4d1350e62981042095fa68a390d9c7d37b36f291bff242324c08461d780a9cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 11752 bytes