Malicious PDF — malware analysis report

Static analysis result for SHA-256 930d520f1ca5772d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 09:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dabb449e39440847db6020f58204a1fd SHA-1: 9d82a59dd0ba4e724042b7df600fea717964ab62 SHA-256: 930d520f1ca5772d37e598c84ee5155cc48083f7866e5e3ccee2c6bebd396fdf
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=can+you+double+split+in+blackjack PDF link annotation
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/rijasux_vitilu_zaxobovogo.pdfIn PDF document text
    • http://emmetrix.net/22409724025tt8wo.pdfIn PDF document text
    • http://lolabarafusiru.iblogger.org/baxuboxapafopovew.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/zedawinog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fd60daf35d72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473903/normal_6004bef60bced.pdfIn PDF document text
    • http://podcard2020.site/why_do_sith_apprentices_kill_their_mastersp7rr5.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/71522492928.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/boilers_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_60478a2de2775.pdfIn PDF document text
    • http://khanapoorti.com/arabic_into_urdu_dictionary0ytvs.pdfIn PDF document text
    • https://vemosesagegedow.weebly.com/uploads/1/3/4/3/134312783/3926198.pdfIn PDF document text
    • http://rastet-malysh.ru/5185159117950vre.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff34f0989365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60349c3426b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_602f94b07521d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzevo.atwebpages.com/artificial_intelligence_techniques_textbook.pdfIn PDF document text
    • http://visunes.myartsonline.com/arabia_felix_bertram_thomas.pdfIn PDF document text
    • http://zusupulek.rf.gd/16076955907.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5256 bytes
SHA-256: c3ac811182df579d0cb10b2ad96accfa5e801028a8dab0d6cacf7870ae6d9ede
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 11336 bytes
SHA-256: 95276748050d8ef85b660b6ac97a6b69a78213fcc5ca0b0d2e8996fae84e38b8