Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef26924a14da417e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f61d26ab1e6bb38bdf7634ca3acfe76 SHA-1: 108498511bb6f4d2ab698e49145fa86625208efc SHA-256: ef26924a14da417ef12084eb14ebad68d6ccb07a42301ecd5d7819c78a8035d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it is used as a delivery mechanism for malicious content, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=samsung+galaxy+secret+codes+list PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/9023609680.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubeketaveletefilojenik.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/80130913137.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/39524787984.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kovofenudifipifu.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/dajorowakemaxe.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/59608608426.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tanipakiwuludapofimadafu.pdfIn PDF document text
    • https://arendic.cl/files/xepuxes.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/34372560582.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/rurosidoduwokogemudek.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/fexokuzuveneder.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/tiseradarunuk.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zamizogugisozasiso.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nenewo.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tekawoxezerumiwikuxix.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/94029234761435b4f1eaa2.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/59287641377.pdfIn PDF document text
    • https://777mto.com/contents/files/dekor.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fuxotazek.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gelojufegi.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092422253573499.pdfIn PDF document text
    • http://skia22.ru/pic/file/94636934198.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_off0000b372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB372 17920 bytes
SHA-256: 059cd7da09c8ba9528742a018086c7447df514f48d4bd4dd09eea50f16b979bb
font_01_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 11104 bytes
SHA-256: 6028316338a80db892b4bed6362378d4821b095a8a87840d63683a45168dea0c
font_02_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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