Malicious PDF — malware analysis report

Static analysis result for SHA-256 1928efb23fd8ba9d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 08:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac4efc3a5678314ae6af8fa0b08ca43e SHA-1: cae3fb7328741c80b25d17baa46f5aa9fc786676 SHA-256: 1928efb23fd8ba9dfeb71c8bebe6b12179240dc15be63bbbbd6d678e3933e323
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting sites. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=the+house+next+door+2021+123movies', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=the+house+next+door+2021+123movies PDF link annotation
    • http://fasson.vip/images/editor/files/82379180460.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/47776137148.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/podejujopeduxiwozowuz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/835d37ba5a38e3bdac46f7f0e3c69449/melelotoromanesofifu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0675a5070---kubopegiw.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/rawusukeridafujuxorewuwu.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/25597488468.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/63064503964.pdfIn PDF document text
    • http://santehnika34.ru/images/file/tidufewozisepifateta.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/lowiralolarumi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gavamedasuxigorudewer.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/33945358646.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zaloselikemunexidubu.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/14682482171.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/76814369855.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rexige.pdfIn PDF document text
    • http://gewald.ru/content/Files/88467092775.pdfIn PDF document text
    • http://sdds.be/userfiles/file/74370491582.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/fisugel.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/vekogevap.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/82535281828.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/buwix.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 11004 bytes
SHA-256: 63554a3f3eec0a7eaae55fcdfc46a912cdea93c9614e037ef7392b555b5def3f
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 18460 bytes
SHA-256: 6951facf65800e53911bb185b6f5f50c855f57190cd21049fc1e6013cdabf57e
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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