Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf551899a1bbf9e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 13:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 151a234d612207877ab5c54de96fbf50 SHA-1: 7b552848c2b99ed9320888e81cc092fa30452e44 SHA-256: dbf551899a1bbf9ef7b92f76ac1419649979179c8cc0ef68c4379ec808554994
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or redirection campaign. The PDF structure and the presence of external URIs strongly suggest it's used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=best+android+phone+to+switch+to+from+iphone PDF link annotation
    • https://harkakotony.hu/UserFiles/file/35197719514.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/demojalokop.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c35cd66ad552e313ca154e95da0c5257/zejirikagomemasevano.pdfIn PDF document text
    • http://bostoncake888.com/UserFiles/files/dexupifiwokobewuxiketunav.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/67077346962.pdfIn PDF document text
    • http://chamdure.com/DATA/files/23357123649.pdfIn PDF document text
    • https://maisonforville.be/documents/file/17036650209.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/38978798037.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/faninodir.pdfIn PDF document text
    • https://istanajp.com/contents/files/legijuvewuramedal.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gonibikoda.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/gapagotejapoxenedan.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/12749835439.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jisuder.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/joluxowela.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bimol.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/nofiregefarexobup.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/50507515040.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/14297925094.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/4387178330.pdfIn PDF document text
    • http://bndweb.nl/upload/files/fuzamovemazuvugutodapa.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/guxasolepukezo.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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10980 bytes
SHA-256: 7183b57da404a7594144340615ce35e910df2912b04a29ebbde99b74ae4d0f57
font_01_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 17192 bytes
SHA-256: d259ffe763c2f0600a640c1885dc147aa9d4865a84a4cbfdbce48be8bbc1185a

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