Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ba4c6c2cec250c…

MALICIOUS

PDF

97.1 KB Created: 2021-09-17 16:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f61f7832e7a64d9c17cbeabcd6114837 SHA-1: a5e438c00acc4735b51f55639c369f9a94622e14 SHA-256: c5ba4c6c2cec250c86c83a60e1f1cf2199880de27d58a8de69057cf20a36ba40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains and configured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and embedded URLs suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://nuocmambason.com/upload/fckimagesfile/109db0d03ac7af46117725890e9ba047.pdf In PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/34383168095.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/93467843357.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/69770897924.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/91643517931.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/gemuwumowewebitoweluwi.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/31237206851.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/tazovuxupudujariwerikixej.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/23579611553.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tuduforijo.pdfIn PDF document text
    • http://isgsrl.it/images/file/69121205347.pdfIn PDF document text
    • http://fxmeat.com/upload/file/270f357fdb4c17ace6394ba3e744bed4.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/63270738128.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/28894634502.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/bekatifu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161421e10f37f4---82447065886.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/vikoviwiwalaw.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/binuri.pdfIn PDF document text
    • http://skisun.it/userfiles/files/nefamumedogaf.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/kikukejejuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cartas+de+recomendacion+laboral+pdfPDF 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_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10952 bytes
SHA-256: cd08c11ca8b1cd7ad6ca62057200ed4a4be44da2b7cf39cc68d33b66615c9d0d
font_01_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 21056 bytes
SHA-256: 6524d86965d9c60fdde7e803226e667530f4727234b8a5cadeb6407021141188
font_02_sfnt_off00015ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.