Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f73935617d22d…

MALICIOUS

PDF

75.5 KB Created: 2021-04-18 19:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab038733f11cb42ffb7fe2d6acfd58b SHA-1: d121f56f6aca4bf2c0d0206a3695ab98183079d1 SHA-256: 249f73935617d22d8b54bc515c07b0158f213616b50e2d3bdb90ccb05e33ee42
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. The embedded URL, 'https://golowaki.ru/strik?utm_term=acordes+de+piano+ingles-espa%25C3%25B1ol', suggests a lure related to 'piano chords' to entice users to click. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common in phishing documents designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/strik?utm_term=acordes+de+piano+ingles-espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4403418/normal_6042d910ab063.pdf
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fdfabf83d50c.pdf
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5fefeb0ebd345.pdf
    • http://nefozufovi.scienceontheweb.net/libro_de_matemticas_5_grado_2019_contestado.pdf
    • http://kofupum.mygamesonline.org/topamolavebedu.pdf
    • http://gazizelasama.getenjoyment.net/sezejezapelenosulo.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_601548ac9678f.pdf
    • https://static.s123-cdn-static.com/uploads/4413454/normal_60058c7dbe8f0.pdf
    • https://cdn.sqhk.co/disegivoji/gdTjjvt/snowball_fight_game_app.pdf
    • https://cdn.sqhk.co/bibobovezave/iisihhb/57503479053.pdf
    • https://cdn.sqhk.co/gobonuzuwif/W4iho29/juwefokedo.pdf
    • https://cdn.sqhk.co/fasisela/iiZEP0F/47256832471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b77ebd59-f04c-43f3-9dc8-fd945274342c/ecuaciones_de_primer_grado_ejemplos_faciles.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_8585c0d7729b4dccae3d62a3456f7239.pdf?index=true
    • http://zitadufafasid.onlinewebshop.net/9564729204.pdf
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_4eaa6b831f764ac8af2928cb47e19249.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a1ac33ad-4903-4e51-930e-b77700c981a3/how_much_is_a_subway_footlong_meal_deal.pdf
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_9a396348816c4aa4a1af70df1f420663.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_off0000e5fe.bin
9acd6273534fe3c278c8f592f0bdd2a5e8ff645bcbd342124760a415fa091fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5476 bytes
font_01_sfnt_off0000f86d.bin
091c43bf9af55d4b6e1e78351190cfe0237b6a4a0e58f3ebdbb47bbf5617730f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 11776 bytes