Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fda15235707140…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 20:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: db782a11d8023f2310e5101907fd4bbb SHA-1: af7357e4293c871481ee5e1384adc26fdf4de9ae SHA-256: b6fda15235707140fa45174de3f4be74897feaded7af488428f842d7bd0ecea8
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The presence of many unknown reputation URLs suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://akgwealthplanner.com/crm/files/69880046883.pdf In PDF document text
    • https://goodline.by/userfiles/file/rebesexutowevujidatamuvep.pdfIn PDF document text
    • http://balone.net/_upload/file///22240495007.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/79959456641.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/69044316757.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/soxaref.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/68196220359.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/11305542895.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/suwonuwinarugalojemuw.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/xibikukibisof.pdfIn PDF document text
    • http://shesob.com/file/files/bijifinube.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/pevopigidapasijawolifug.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/41053592420.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911202413.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/36145048036.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/fereneposizolevewola.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/28805001750.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/23380480262.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/58820406681.pdfIn PDF document text
    • http://rsst77.ru/upload/files/meruzamodazipupo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/12120811285.pdfIn PDF document text
    • https://wrd13.com/force/file/41492362308.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140acda6cfb4---90534893537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+online+games+androidPDF link annotation
    • 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_off0000adc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC3 15268 bytes
SHA-256: 48c1d44e74f38223e7bebceb01b242b3ac803d2762bbbf4c205f151879d9fd1e
font_01_sfnt_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10584 bytes
SHA-256: 700caf9bf970cd7e7b5d8ca5c6fd3f7cdb9897a252da1d5fbad1d129f4503a8f