Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcbd053f06a64d4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 23:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb6f5bda578d0f8f45caef81d99a1ce1 SHA-1: 056b9e2f60f69464de4cfefa64a53d206768cf8b SHA-256: ebcbd053f06a64d4188778463a0bcedd8d91c8cd1e88052d7d2b159ea9109faf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=language+setting+in+phone PDF link annotation
    • http://shengyaweb.com/uploadfile/file/2021090702371317.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/61513588083.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a06cbb63---58824440059.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vizufugelisikajoxid.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fejojak.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/detupaburup.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/38038166849.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/vules.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f7856a0b---repivisunumiguvedigoxaw.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/16101418717.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/4763146667.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sokofazotekadixefo.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/33263567244.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/26402597984.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/menugu.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/87114883821.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/seporafifuraferejupobip.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/39822423525.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/fuwijuvisomolexufodirom.pdfIn PDF document text
    • https://educhina.mn/editor/files/17931432043.pdfIn PDF document text
    • http://anm-av.de/uploads/files/rofejelegem.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/60998102401.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/16231912740.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/31284368658.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/30794510836.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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 10444 bytes
SHA-256: b2c41ddfcaab28ef9243a28e1d4903a8273323402412c0971a04012b19d56940
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16688 bytes
SHA-256: 12f08beaa4ba9c53eb81f7d73623a92db0cd3b8ed0721cd7b8ce31ed5850b4de
font_02_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1