Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc19fda13d4b4e68…

MALICIOUS

PDF

110.7 KB Created: 2021-04-04 19:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da132335ec82315ff07253550aa53cd4 SHA-1: 96451d137ae5e8fad9299e0668e69558aebeb111 SHA-256: bc19fda13d4b4e689d4554b4b8bf5203fbe921aee7933984c2d70342ca7dccce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=how+do+you+calculate+wavenumber PDF link annotation
    • https://cdn.sqhk.co/kedetofido/EKjgiji/minor_accident_report_dubai_police.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/anno_1800_production_chains.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/how_to_program_a_rain_bird_sprinkler_system.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/tijisakulibolu.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jcjd3ML/duvomakudiwufukatin.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/iGOib3j/world_beach_soccer_championships.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/Ehiyjhm/strategy_games_free_download_for_windows_10.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/carbon_nanotubes_notes.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/what_is_information_society.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/ieheehf/guziw.pdfIn PDF document text
    • http://pimavegi.22web.org/horoscope_apps_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxafedijumexir.rf.gd/nevuxenatebetafulu.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wesegu.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_cb16888846bf4575befbe5cfeafa2656.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_517e7d40e94f4ebdbd3a03a5052f3ada.pdf?index=trueIn PDF document text
    • http://mevuxuru.atwebpages.com/vidaxevuriwemasiribajef.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/mind_expanding_meme_template.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_715f89e9a2454374baf529559bafe276.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/xuzoderuke.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/tonight_west_side_story_score.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_off00017570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17570 5264 bytes
SHA-256: aad132884dbde410e53d68ad44530ce695d192c348a812405c60b53b22696654
font_01_sfnt_off00018757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18757 11288 bytes
SHA-256: 30a426d2cda627b395d2e49a9e73f4c7838a152509cf85e3cd9dd53db7da4194

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