Malicious PDF — malware analysis report

Static analysis result for SHA-256 deab4f137d847b1a…

MALICIOUS

PDF

110.6 KB Created: 2021-09-16 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd08ba2b1f72426a0a79724239b225d5 SHA-1: e878067701c078a4d38b604216bb18d768af887d SHA-256: deab4f137d847b1aa9dac6af4650e4821c2d2eb9ed3bcfa8898a4382dad7de9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://begemot-rus.com/uploadfiles/file/2021090305011373499.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q5nqr8dj64nmitaigc0rlboie2/27336594229.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/88305392625.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/nidat.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/43094526227.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/21909485452.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rikuzopaxawaretiwes.pdfIn PDF document text
    • http://chayka-svg.ru/files/11141999951.pdfIn PDF document text
    • http://terminsk.by/pics/files/dudinoravo.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/fepaxabezetakegal.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/31205347565.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xutuj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb91622a5d---sovupi.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/23897041343.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/lozenukojizu.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/32211095250.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/muduka.pdfIn PDF document text
    • http://njxinbell.com/upload/files/58701165623.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fuwufad.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/bejarafawerozobipo.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/95826240408.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/3133859205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+graphics+drawablePDF 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_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 18872 bytes
SHA-256: 958cb611a7a477e5ce81c2c2891c5cdbb27952ae68463bcf3dc344aa15c81e25
font_01_sfnt_off0001656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656B 17800 bytes
SHA-256: ba33e1c7c12cf11a1ea1277fb0ace1b2efb9d74b07955ba772f3c2dfba24da91
font_02_sfnt_off00019492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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