Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e700ae48a6cf0e7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bae274b9fb0daa25314173e16384e0d7 SHA-1: c8c231bb2268f2eb2e4af8b265f0235d8968be86 SHA-256: 3e700ae48a6cf0e7b4c7179371f0d91dae57f9ee04dc4ed815a6f34301fc5bff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic findings strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sakem.org/userfiles/files/51832121258.pdf In PDF document text
    • https://selispin.com/calisma2/files/uploads/kifulotipewog.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/76562658781.pdfIn PDF document text
    • https://festacontinua.it/public/file/lusifemug.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/11513179010.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cf7d4ba7ebe6b1fcde2e0e6f23c1fc21/likoxarixutumetodirajo.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/93189075373.pdfIn PDF document text
    • http://zae.me/datafiles/file/83205218796.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210903103855.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/70393744876.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/8677706144.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/96488598393.pdfIn PDF document text
    • http://darec.sk/files/files/kitofejaxozujikivewametij.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/29485039169.pdfIn PDF document text
    • http://innotack.com/userfiles/files/10583226197.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jikaginifexizazasaw.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/27935788971.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tedazuxakazomujixisone.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714cbb426e---92446218909.pdfIn PDF document text
    • https://flomogroup.com/upload/files/menelomu.pdfIn PDF document text
    • https://netpage.info/userfiles/file/mefibegefunum.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/83050593900.pdfIn PDF document text
    • http://cartopack.com/Images/file/nukekol.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/lulakoduboripoxadofifob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+animation+application+for+androidPDF 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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 17708 bytes
SHA-256: a7e827a13f76f1a24138fd4283319d3594d3e2556949a37e49aaac833db0f505
font_01_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10832 bytes
SHA-256: 6988740d1c537d80a9b7bd36615153f67f72f2f003d7656b716162966b81425b
font_02_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1