Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a03f9e221f910b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 06:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a3bd29d18abffd5423289bc3419da17 SHA-1: a3d68e53ddfcc5ac4112f834cfeaccc83342d813 SHA-256: 84a03f9e221f910b4d0abd9548604c4d6bb7510b62f38853dc97973d4b9a5774
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or phishing lure. While no specific script was extracted, the presence of external links and the PDF structure point towards a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://autoradiator.mn/uploads/ckfinder/files/36751987055.pdf In PDF document text
    • http://lechioutdoor.com/userfiles/file/duwunapanirerufepidur.pdfIn PDF document text
    • https://everestart.com/images/stories/file/34907544478.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/12979498718.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/doviz.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/tojavulorewedixejida.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109032346591569.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/1349709975.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/sogasemagejarifaneture.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/rivezulawit.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/pitobikonobasefemilovaxa.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/jametodoritegaton.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/55261747757.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/680592521d47d9370234914c85931049/39357726813.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/mupoxavojigul.pdfIn PDF document text
    • https://mauspro.net/upload/files/ziwazowujowoxonogabuzis.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kabig.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/99580552697.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/850dfef7e7af8a67848261474a34d2aa/naxavenesupubet.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/12039453979.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/fumaliselil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stillness+speaks+pdf+downloadPDF 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_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 10644 bytes
SHA-256: ec752b0996be44b4bfd1d46d0e557a9d477b154c2483fe8a4aa3c3dc7f02a1dc
font_01_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 17128 bytes
SHA-256: 39f60d11d772885a3ac1b1dd36988ef2170a76269adaaa202cb1a977abfaff4d