Malicious PDF — malware analysis report

Static analysis result for SHA-256 de64dae3da7dfbf8…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 23:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2af860d5f5ac8bf063962bb9d3662ec2 SHA-1: 9fb1d92f0ff6215149ffcf4161a0e99cc21a694f SHA-256: de64dae3da7dfbf8ff89ca468e1c191c9d61dc80f29ab900d2f4b40b3f4992c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=watch+the+simpsons+season+28 PDF link annotation
    • https://landtop.com/filespath/files/20210910195644.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/19672980663.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/vonagekavotaxu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mufefalafotuxebanumo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/56668890989.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/51220127132.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5abc73d396ea137cee85380375a48518/38947475041.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mijuwilopipogevagavajaz.pdfIn PDF document text
    • http://epmachine.ru/d/files/36169079664.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/4505949164.pdfIn PDF document text
    • http://velisend.ru/photos/file/52354236731.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/18926220785.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/61897606115.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/3412360896.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qnpllcjla3hdmvu4spe134jpc3/gaxupuzo.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/redorifugenej.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_205244.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/9649430038.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/52479908659.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/84967813131.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210904205931.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_off0000acd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 10816 bytes
SHA-256: 0394535a887ee8085a94236e3e41db8b5b8cc4cfe357041792967b213848ae66
font_01_sfnt_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 15864 bytes
SHA-256: 7f240ba626e25533057e85c995f13d923419ce65494682b77ee0189f86bdb5cc
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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