Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8b0ccdfd8c9091…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 10:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfee57c12824d3f4efe2b94bfb4007ea SHA-1: a220802efdb21b0a30a531192f3f3ae5b34c645c SHA-256: 8b8b0ccdfd8c90914342973905e08a70f4bd9abde52ddbd2f8a0404747d343a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are structured as link farms, suggesting an attempt to direct users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host malicious content across multiple domains. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://sabresources.com/FCKuploads/file/vepagikomukamuvusek.pdf In PDF document text
    • http://www.atsamuihaus.com/image/upload/File/lizofefasefesilemaf.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/xaxix.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/5275999009.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/wejilenozuwogajez.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70585127230.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/39344186676.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/42052321381.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/27034549633.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/10938421466.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613678af6d699---20492217378.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/lopogujepaz.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/pifuvel.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/67135765856.pdfIn PDF document text
    • http://hkalc.com/userfiles/fabudipefepusalozevegas.pdfIn PDF document text
    • http://change4best.ru/upload/file/99803487332.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/situgetulazaxeguwazuv.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/65676166318.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/35058150616.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/15093399128.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/15993287400.pdfIn PDF document text
    • https://brukspec.pl/upload/file/73542451181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+2.3+6+version+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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 17600 bytes
SHA-256: 188e3f9f0477701b873648882aeef4e3f19851d0c708f8bd0cbd62ffdf332929
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 11056 bytes
SHA-256: b3e87d838bfbd2a6cec90111ee895c8fe895c9dc2774a9eb1d445c6945949f8c

Open this report in the interactive analyzer, or submit your own file for analysis.