Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92c255b844dc27f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 14:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e2375200ab5d1b1dc1bf2cf46d8ce8e SHA-1: 142d64aea3592adcc5566ffdee39c87a2a32a753 SHA-256: b92c255b844dc27fabd92e89b32f9de8e237734a3ecaa8d85d43e925ba2f8615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://garglob.ru/uplcv?utm_term=netzwerk+a1+arbeitsbuch+l%C3%B6sungen PDF link annotation
    • https://kudamatsu.org/userfiles/file/zudivojemafavu.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xoxafuluramojixelanojiw.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/jivapiguva.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tizonam.pdfIn PDF document text
    • http://vce34.ru/attachments/file/josagefunepuk.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/44358389589.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/begudamelotutovun.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/fuvotodipukan.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210912_BE0750781D4B5A99.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10209be01---91733450632.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/87149483623.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wirivuw.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/muguxikaguxadog.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/dusegafekesanebenukusigu.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/tugij.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kisibasizitojerubideba.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/wumibagosalafuwakedosew.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76612617572.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/51845159512.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/rejisojidoxozoti.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ziwuwuworuvig.pdfIn PDF document text
    • https://ancoraeducacion.com/images/37205427072.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/vojaxikaxidopilusuv.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/26529322870.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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 11108 bytes
SHA-256: 3e1baf28a537942680ed322aa6597bd7201ebda3a0a6889729a0606bbe955788
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 14828 bytes
SHA-256: ec503e5aed89177322ddae2fc05edeb86bd1591bca130d88b2a3a0d1b6acfc95