Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd7711ccff27f08…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 19:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af70b22a636d3399091dc3169ac5dfef SHA-1: ee2ce1b7087df900878e69dbd5b5702d7f37a1f5 SHA-256: 0bd7711ccff27f08bbab795b856672ed8b0c4897eabfa9e54a63066c4c4be78e
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 structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=hd+wallpaper+a51 PDF link annotation
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/fitel.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/bimujarimawe.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/9850318790.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/22143534760.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b58ae0e03b71869fcd007c15fed03f73/50193759622.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/29340383979.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/tevelusasifax.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2b0ed2c3---rukegidemiradunojaluke.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/69309856759.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/82562468846.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/49927877410.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rewejifazajatem.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/jivezonajivosimivate.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/69476543037.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/janatebuwuferutozugasego.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/34280136325.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/52058873393.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/50318221494.pdfIn PDF document text
    • https://hoongnau.com/upload/files/30992072903.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zesogama.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/46284465183.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109061952451963.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 10068 bytes
SHA-256: 520f80fad4d096817262ed8a079248abcde7243f152eb4bb93ad7cad292a6632
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 17692 bytes
SHA-256: feb72e65cbbc4db688df0508c2189ff725095a4fdf3147a5e89f6eb4fae977cf
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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