Malicious PDF — malware analysis report

Static analysis result for SHA-256 a849bfd93052286d…

MALICIOUS

PDF

81.2 KB Created: 2021-05-17 02:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da449b35d43044b0b83aa65333a513a7 SHA-1: 9afbb53b622e864034aa4ef24e6afc0bf8cd3f02 SHA-256: a849bfd93052286d20c4eba4d370893180c235ba2d93bf47b79305ed57334dd5
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms its malicious nature. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt, likely leveraging a social engineering lure related to quality manuals.

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://zajinet.ru/strik?utm_term=como+hacer+un+manual+de+calidad
    • http://fetedeju.mygamesonline.org/biology_gk_questions_and_answers.pdf
    • http://xadazobisisim.scienceontheweb.net/brother_kodaline_sheet_music.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/is_python_enough_for_machine_learning.pdf
    • https://cdn.sqhk.co/wofunukasu/Yim2hgO/home_restoration_experts_inc_naperville_il.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_602b5eec904c2.pdf
    • http://ximikilanad.22web.org/dovojopedukuxuladejani.pdf
    • https://cdn.sqhk.co/xogovofofi/ieBic9S/age_of_conquest_iv_tips_and_tricks.pdf
    • https://cdn.sqhk.co/jovowosifo/fhakheb/black_friday_iphone_deals_2019_uk_o2.pdf
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31c651fcf9.pdf
    • https://cdn.sqhk.co/ferobisuw/hjhfeUW/rivosejifaf.pdf
    • https://cdn-cms.f-static.net/uploads/4391326/normal_605bc3246b3bc.pdf
    • https://cdn.sqhk.co/busibelifiv/iaWhiYM/card_maker_creator_for_cricut.pdf
    • https://cdn.sqhk.co/lawafopugu/UQaiqg7/dream_piano_music_game_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4473445/normal_6047aad6b1c91.pdf
    • http://numusuri.22web.org/outlook_2016_create_email_template_with_fields.pdf
    • https://cdn-cms.f-static.net/uploads/4379379/normal_605ddcd5acf67.pdf
    • https://cdn.sqhk.co/jawubibegeba/ghgKhgv/cryptopop_earn_free_eth.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fidefofudi/portland_light_rail_cost.pdf
    • https://s3.amazonaws.com/xisakazelelinim/software_per_biglietti_da_visita_free.pdf
    • https://s3.amazonaws.com/bejenosugede/90501749441.pdf
    • https://s3.amazonaws.com/fekaduvopigab/automatic_identification_system_ais.pdf
    • http://bejumajiluwod.rf.gd/tedopebivuxupimojuza.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_off0000ff15.bin
edb7a7d163bbfc71912dc3d388c230108606f4d3845f111d80e7e5fa026d0b07
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 4908 bytes
font_01_sfnt_off00010f8f.bin
661b6453c8c72211ade5dc060b2e90b0731da9b9a484b1d20b06151da352a34d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 11828 bytes