Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7a5b1c1e6edd18…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 16:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fbc707b73b9178a235c3b86e4ee1b6a SHA-1: 203263b95b87cc0ca5faea9f8a0fab5867c9276f SHA-256: ba7a5b1c1e6edd18ee8406940a458ad1dac95d950bfaf9aec082d698c95ba156
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, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to heart arrhythmias, likely serving as a lure. The presence of numerous embedded URLs, including the primary malicious URL 'https://vilenefex.ru/strik', suggests the document's intent is to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://vilenefex.ru/strik?utm_term=qu%25C3%25A9+se+siente+cuando+se+tiene+una+arritmia
    • http://lapitubemexidi.mywebcommunity.org/vaxuzodovamarigosivabes.pdf
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fcb9d55747c7.pdf
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5fff6efc2fefd.pdf
    • https://cdn.sqhk.co/sosexazefip/gdjejje/acc_football_championship_2019.pdf
    • https://cdn.sqhk.co/ludibipimilu/figjbic/38600665176.pdf
    • http://suzolovopu.iblogger.org/new_york_times_college_point_jobs.pdf
    • http://xizerunax.scienceontheweb.net/waiting_for_the_barbarians_plot_summary.pdf
    • https://static.s123-cdn-static.com/uploads/4475565/normal_60065ae34e441.pdf
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd1665e71736.pdf
    • https://cdn.sqhk.co/sozivowemin/IiivhjB/monkey_wrench_meaning_english.pdf
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5fcccb4205808.pdf
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcf4fdbef04c.pdf
    • http://legegapepapo.medianewsonline.com/skripsi_tentang_akuntansi_manajemen.pdf
    • https://cdn.sqhk.co/firokizita/mjjjbgj/glory_of_generals2_ace_mod.pdf
    • https://cdn.sqhk.co/xiladuxe/Qiahcb0/calculator_for_clash_of_kings_cok.pdf
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6011f08a9900d.pdf
    • https://cdn-cms.f-static.net/uploads/4463560/normal_5fdc56502593c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vevisadoko.epizy.com/95232023688.pdf
    • http://kojevarokor.rf.gd/xirekuvononafekeduxexob.pdf
    • https://uploads.strikinglycdn.com/files/158c6c34-3381-4c0a-a343-0dd85b591c32/game_maker_2_tutorial_drag_and_drop.pdf
    • http://zifiroduvibo.rf.gd/in_search_of_respect_chapter_2_summary.pdf
    • http://zakefuki.myartsonline.com/45203152884.pdf
    • https://uploads.strikinglycdn.com/files/b34ff297-9e5d-4f56-879b-6f4860303e60/how_to_clean_mr_clean_spin_mop.pdf
    • http://bebezira.epizy.com/sample_business_plan_for_barber_shop.pdf
    • http://bumurulepowele.myartsonline.com/cummins_diesel_generator_troubleshooting_guide.pdf
    • https://uploads.strikinglycdn.com/files/d42c85fe-8b63-4ffd-ac9f-4286c2edc99d/64429020273.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_off00010352.bin
45af69acbff94ef72245b2bbad058a0b770206946a8f795c218714007d2a9f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 5256 bytes
font_01_sfnt_off000114d6.bin
56e3fdf4c95f575a22e277ad1dc4b42508be4033a7890952f944a3b7725a17ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 11548 bytes

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