Malicious PDF — malware analysis report

Static analysis result for SHA-256 18243369bc781a6b…

MALICIOUS

PDF

70.1 KB Created: 2021-04-04 02:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189711b93de068eb82cd792014dc991f SHA-1: 24d8bbb3e6cb483c53967d26467ddff728ab33ee SHA-256: 18243369bc781a6b3f9bcc76ebe95332543f147eeb3dd18ba90461e66ca6c725
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to car sales. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded links points towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=lexus+rx+350+for+sale
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/kamokejefiti.pdf
    • http://levantegroup.net/vilivijunijib9h63n.pdf
    • http://begdas.space/maravilloso_desastre_saga_completaxvl6q.pdf
    • http://hightrade.club/gamerep8vgmv.pdf
    • https://cdn.sqhk.co/rabataxuvax/fZihprs/mazovamedile.pdf
    • http://storeeuro.info/m4_smart_bracelet_user_manualffe0j.pdf
    • https://cdn.sqhk.co/xupotuferu/RFgfhDq/intrauterine_death_management_guidelines.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/333433.pdf
    • http://optarfes.com/a_raisin_in_the_sun_movie_1961ghm4k.pdf
    • http://befotuke.mywebcommunity.org/combined_gas_law_problems_worksheet_answers.pdf
    • https://cdn.sqhk.co/devisofage/higjJid/moto_file_manager_apk_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_30bbc751cb9546a2b9bcecca6e4ffa42.pdf?index=true
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_3c67774234214287b18c8bc95724f8b5.pdf?index=true
    • http://tapoloferazuziw.atwebpages.com/vivufogavejijedepizob.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_6e3c0ca9073e4e73805d6b13ce3d1b8f.pdf?index=true
    • https://s3.amazonaws.com/xirixepo/69248218466.pdf
    • https://s3.amazonaws.com/tobaziw/15580862848.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_544d1b362a99459ca4d99dc6e31f9b9f.pdf?index=true
    • https://s3.amazonaws.com/jakujakula/bandook_chalegi_2_video_mein_mp4.pdf
    • https://s3.amazonaws.com/jidosatikim/buwumetutejo.pdf
    • http://kavibajegis.onlinewebshop.net/7108918120.pdf
    • https://s3.amazonaws.com/tabobujimo/65275118424.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_off0000d88f.bin
0e52b4a3256a965c59c31450406743cfaa59b3f5a9db9cf49ad9af6d8c6a2c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 5200 bytes
font_01_sfnt_off0000ea59.bin
38c9131d329f6d2fab5947c99d2e786ec163ae838830f5b286e80e5cc080fe49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 9676 bytes

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