Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0eb20b12801b5…

MALICIOUS

PDF

76.2 KB Created: 2021-04-25 00:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b647c958b70aee0c686bcc8e7266e9c SHA-1: 74ce894cbb272c4de0b6643efd405157268fefaf SHA-256: efa0eb20b12801b57866a7185ba81ee7453244e29961e320b18995a1cad37143
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a high-risk indicator. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure referencing a book chapter, likely to trick users into visiting the malicious URL for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=maus+pdf+chapter+4
    • http://cherrypimp.online/debimugav20gm.pdf
    • http://mofopafilubo.22web.org/vajebuxepufexitanavese.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_601fc4ef44e6f.pdf
    • https://cdn-cms.f-static.net/uploads/4374983/normal_6063f24dbdb99.pdf
    • http://hiziryigit.online/kesefebakilazupowon63.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_6011534d0aedf.pdf
    • http://leree6.club/81456477801afw2i.pdf
    • http://ru-dev.xyz/how_do_i_stop_my_keurig_from_filling_up30t9d.pdf
    • http://smeshnoykir.space/68736231018ekqu2.pdf
    • https://cdn-cms.f-static.net/uploads/4491725/normal_6065608d21efa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tuxalowafokuvo/what_is_the_commerce_and_slave_trade_compromise_explain.pdf
    • http://vekimawo.rf.gd/largest_battery_android_phone.pdf
    • https://s3.amazonaws.com/gomaxod/machine_learning_engineer_salary_in_bangalore.pdf
    • http://likutolejit.onlinewebshop.net/how_to_maintain_a_pressure_washer_pump_oil.pdf
    • https://s3.amazonaws.com/fedufiporara/how_to_play_beginners_chess.pdf
    • http://zikituxepori.epizy.com/capsaicina_propiedades.pdf
    • https://s3.amazonaws.com/mavixu/bubomujubiwuri.pdf
    • https://s3.amazonaws.com/fadadedezeker/dark_souls_3_third_boss_guide.pdf
    • https://s3.amazonaws.com/jeworurowam/best_power_transformer_for_europe.pdf
    • https://s3.amazonaws.com/pibajuwi/working_capital_balance_sheet_accounts.pdf
    • https://s3.amazonaws.com/dosalapasenow/pijurigutagagududawaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a4.bin
c0b34215539760f287666acbd87b6df5a4b1e228b1b17a1597c17117878a9302
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 4920 bytes
font_01_sfnt_off0000f179.bin
e3874e7a107e1d3e0de4c02f21adc26f9c9ac4e277604194d7676f213daa088c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10488 bytes
font_02_sfnt_off00011561.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 4324 bytes