Malicious PDF — malware analysis report

Static analysis result for SHA-256 26055e390e1bf2b9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 11:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f62cf62e4d798175dea8c50290fcfda6 SHA-1: 191804908f26693892b45abaf44b68b1ee5a9a81 SHA-256: 26055e390e1bf2b958fcb54682a676e173ce049c676457a86b471d068da484b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Numerous external URLs were extracted, many of which are embedded within the PDF structure, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of embedded links indicate an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=auburn+tigers+wallpaper+for+android PDF link annotation
    • http://refpecsbelvaros.hu/kepek/files/72256447267.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mojuwozemeroji.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/31369117782.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/61194744778.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/lowonoxav.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/32204539616.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20045765901.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/vanilowonelik.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/jotuxiwix.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/patuwinezen.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lubenalumosemogefasotunoz.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/27877605588.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bfbcd91---lozuzopesufobebede.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613483f87e495---78767497362.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/9767222190.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/72808567264.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/67592951115.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/34013720391.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/55663339855.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/92673094196.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xudiwonizuv.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/zuvofumujuminozezixukag.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/87679689851.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/40980343814.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 20000 bytes
SHA-256: 2b550bb5c9f4a66eb1044a3ef5a5c02d0e04333025753a2e0cddd32a66f5343e
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10980 bytes
SHA-256: 8ad49ff9d15063a10d2b9e9534cb330a653582f2d9a1134369c5d6c27c7cb208