Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c31a9816afb0ad…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 01:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06d35fb0253558939da12153f6e1b633 SHA-1: ba44e15109a47c732cdd92bd56dd72ea198c3fb0 SHA-256: f0c31a9816afb0ad8dae909640caa5203fbf23384f8e422d45dccfbc305dbe7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many 'unknown' reputation URLs strongly suggest a malicious redirection or phishing scheme. While no scripts were directly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious intent, possibly involving embedded exploits or obfuscated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://96stone.ru/userfiles/file/sonufuregowibetikibo.pdf In PDF document text
    • https://sushixusa.com/userfiles/files/89288050820.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/vemobujikogopufid.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/jedijajiwatedaf.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/siwufidijuvawuken.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vuroseko.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/dudenaja.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/danel.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/jupizalipazive.pdfIn PDF document text
    • http://salkim.com/userfiles/file/29548550151.pdfIn PDF document text
    • https://majubesar.net/contents/files/xajukibotufujevuz.pdfIn PDF document text
    • http://szm.hu/userfiles/file/korek.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/67429142582.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xagowasojalinepupudol.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/konoxoke.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/kimakerovusesogib.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gujawubotakezej.pdfIn PDF document text
    • http://safarang.com/basefile/files/fugogasizev.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/75227147699.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/32012932594.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210905135549345.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2fce43ba---mogolu.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/rupoxidudawi.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/vexaliwimajetoradukemiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=100+mb+ppsspp+games+free+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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 17740 bytes
SHA-256: 31edb4734dffd39f12e156cb3d460a4a2d2a757e327f851304ef25f2f56c9a16
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10956 bytes
SHA-256: 0d7c60327649b2675442718f52f2939aa2b602999ef8a6306c5f417826ebba5a