Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3d0b7fd857a3a9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 13:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3c82dad70b67470b2af019064f65035 SHA-1: 1646ad5210d3569167fb1ae8e0e95caf9c2120bd SHA-256: 6e3d0b7fd857a3a975bfed45fa8004341a3652e9f93704658c6c0c95be38b657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a content distribution or SEO poisoning scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hyeminshop.com/DATA/files/70558396421.pdf In PDF document text
    • http://master-stroi76.ru/userfiles/file/92363043667.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/97200266292.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/katuxilejenabatedowuwa.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/83463624523.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/58635259670.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/7407792538.pdfIn PDF document text
    • http://sjanzee.nl/file/20584353521.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/7574197168.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/80781861313.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/72601575614.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/5237582990.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/xapomo.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109012153555010.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/93134200878.pdfIn PDF document text
    • https://olterus.com/contents/files/kuvofasanir.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/mafugogid.pdfIn PDF document text
    • http://heizler.hu/files/file/80320482991.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/vizenebemixilukak.pdfIn PDF document text
    • https://2winit.com/Files/files/suxilubumigititelox.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/39496359401.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zizovoru.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/97404084950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=turbo+vpn+mod+apk+vipPDF 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 10468 bytes
SHA-256: 4f79b6061e15f1adf85c3aec3a9cc0b87723bb3b2da13848787fc125f904def3
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 18056 bytes
SHA-256: 4f7daa09922386f8415894be6ec50cb880202e2587a5a567947a95f6a2e9b566

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