Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1986e2b1cbc84…

MALICIOUS

PDF

86.3 KB Created: 2021-03-14 23:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f752800fd3bb05b5c5479935361be91 SHA-1: 74aa497e9a284c9e60849f382c0b92711e636d7e SHA-256: 87a1986e2b1cbc84011cfd7684d05cd7605e0b9d0f16a16fa2c05bf9a1b0b2d0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_URI heuristic pointing to 'zajinet.ru' suggests an attempt to redirect the user to a malicious site, likely for downloading further malware. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jumping+the+broom+2011+english+subtitles
    • http://callup.today/kreepy_krauly_-_kruiser_k60400_in_ground_suction_side_pool_cleanerfqanm.pdf
    • http://nickned.me/253396879976spys.pdf
    • http://antinomi.design/mathematical_statistics_with_applications_7th_edition_solutions4ryp7.pdf
    • https://cdn.sqhk.co/rifarako/ig1licQ/fighter_spacecraft_model.pdf
    • https://cdn.sqhk.co/jezumasulej/jdgfshf/push_maze_puzzle_level_359.pdf
    • http://wiinorama.fun/juxisivovudizajvdtee.pdf
    • https://cdn.sqhk.co/supibufuk/SNcsduJ/88993393061.pdf
    • http://verefdliyvtorogo.xyz/cerfa_15776_modifiableypvkc.pdf
    • https://cdn.sqhk.co/zuvomafoda/sQjhiaM/warhammer_40._000_space_wolf_switch_test.pdf
    • https://cdn.sqhk.co/rixakowu/cDxUNA1/51514247892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajezife/detroit_pistons_injury_report_update.pdf
    • https://s3.amazonaws.com/palevijuj/77038716661.pdf
    • https://s3.amazonaws.com/gezizefefififa/62652601682.pdf
    • https://s3.amazonaws.com/bejikefowu/bts_dna_choreography_mp4.pdf
    • https://s3.amazonaws.com/jixerubowi/1131075906.pdf
    • https://s3.amazonaws.com/pegozegi/sai_brushes_deviantart.pdf
    • https://s3.amazonaws.com/murudute/crontab_format_solaris_10.pdf
    • https://s3.amazonaws.com/fosagobomap/29277608877.pdf
    • https://s3.amazonaws.com/zetubakuz/30401675397.pdf
    • http://memonexato.epizy.com/birthday_candles_video.pdf
    • https://s3.amazonaws.com/tufitijinexu/fasozemofovatepumiso.pdf
    • http://kukatunudivolu.epizy.com/abcd_movie_hd_tamilrockers.pdf
    • https://s3.amazonaws.com/ravuxudibure/97444729112.pdf
    • https://s3.amazonaws.com/jifesu/15992670411.pdf
    • http://kebojupevanivi.rf.gd/bilingual_french_dictionary.pdf
    • https://s3.amazonaws.com/robumuduluwise/senorita_piano_sheet_roblox.pdf
    • http://pobutimakivuxeg.rf.gd/how_to_write_a_warning_letter_to_an_employee_for_absenteeism.pdf
    • https://s3.amazonaws.com/gedesisumi/ragodale.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e4.bin
0d9179e52afa349703acdf7f80b0dce453fac787664e0bc117909ea0525c1216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 5476 bytes
font_01_sfnt_off0001065e.bin
ea52b0faeadc1e1f322f0a330ebc8c6e3fc4d51cdc81c4f8855c537fc3ac5e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 14960 bytes
font_02_sfnt_off0001360b.bin
296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 16192 bytes

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