Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf2a7924b026924…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 15:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bcd271391acfe0796411d2d7736e412 SHA-1: 764695dbed05a21a56e79f5ede1f5c0586f7d318 SHA-256: 8cf2a7924b0269246f3c1f5cf3eee5fd16f54f450c9060fd8189ac7401fc5629
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The PDF structure and embedded URLs point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=wombo+ai+pro+apk PDF link annotation
    • http://slkuang.com/v15/Upload/file/2021911919228700.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/xewofagevimopubugagaxosed.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mafug.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/dawabepalamesulegipu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66405844652.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fabiginaxelegexudedatalot.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zejoxifer.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/putipurepe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ab45d5807804a2da36e3b9c775d97be0/nuwuzazufe.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/zibiwuv.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/3825685586.pdfIn PDF document text
    • http://air-ned.com/uploads/files/lerobopabalepir.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/ferozevatuxogajulikigoz.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/57243871952.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/sabalebuvabut.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/39885256311.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252a58585f---zijudowax.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/53929379687.pdfIn PDF document text
    • http://czyxchem.com/upload/files/surapibo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/lidoremaviketixeguximabub.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/kesedu.pdfIn PDF document text
    • http://jawarakreasi.com/file/finozajesenipoxebu.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/11430455880.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/nivovatigiwizes.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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 18336 bytes
SHA-256: 4d73086b290aa20c7dc9ef30a4dd7c73271a74fb103bfc18462271d5f15e8bac
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10088 bytes
SHA-256: b0e6df4ae075c610d12a2544c7a02b0fafca555a67b77b8afbbc5e56e2d56bac
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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