Malicious PDF — malware analysis report

Static analysis result for SHA-256 524c94480a0836d6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 15:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1537c7d84b771b017db48d274f997aac SHA-1: 58de63841bf7f25450271af6f2185b8e5543e425 SHA-256: 524c94480a0836d60ea4afef563e5ba1eec829f0f1b2298836a4ff9ca57e4986
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=chemical+bonding+worksheet+%25232+%2528types+of+bonds%2529+answer+key PDF link annotation
    • http://reform-st.ru/how_much_is_a_2018_yamaha_r6zqkj6.pdfIn PDF document text
    • http://petersikdar.com/where_to_buy_nutone_central_vacuum_parts4lwr9.pdfIn PDF document text
    • http://artistichomesolutions.com/princeton_review_sat_math_2aobbv.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/271525.pdfIn PDF document text
    • https://sojopukav.weebly.com/uploads/1/3/4/2/134266177/kijowafemetaninok.pdfIn PDF document text
    • http://cz-nitrof.website/putting_sheetrock_on_basement_wallsbhrwe.pdfIn PDF document text
    • http://edevletorg.com/9158685317q9h6d.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/2057838.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/wifevovewuvojidavugianrni.pdfIn PDF document text
    • http://fixetufuzafix.22web.org/zaxugabajajalevos.pdfIn PDF document text
    • http://sexesex.site/define_non_programmed_decision16j02.pdfIn PDF document text
    • http://hookup681.site/smart_dealership_near_meevwbt.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/tipozazagu-zisuwolemok-movukuzilewi.pdfIn PDF document text
    • http://brumbum6.xyz/dangling_modifiers_worksheetsf6rb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gukedam.rf.gd/9471211668.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/witezebozadewet.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/facebook_sdk_unity_android.pdfIn PDF document text
    • http://koponobazad.rf.gd/money_loan_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/migratory_beekeeping_ielts_mentor_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/24256510288.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/white_rodgers_thermostat_reset_1f85-277.pdfIn PDF document text
    • http://widuxetikos.epizy.com/21827774048.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/jebikeruferavomeruv.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/amity_park_cheat_code_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/vinonatukasig.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5552 bytes
SHA-256: 734c8953b7cece6de0302e17e554d7f8884d4d6fd2fc3e665e3b74131d4bc233
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10936 bytes
SHA-256: ae19b78b9253db17b19d10ed7c9c5cc465f592bf8edccf1a0c0986da4b4142c8

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