Malicious PDF — malware analysis report

Static analysis result for SHA-256 7742276ce610e568…

MALICIOUS

PDF

81.6 KB Created: 2021-10-07 18:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7a5d9ee1c5630fc462b7efc87df4246 SHA-1: 645e6e6d69ba9a595acbdd78ca6c8db6a2d50007 SHA-256: 7742276ce610e56892e34d5cf62e0f9b675f88ad33a49481519e2faf90e8e36d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://conganbacgiang.vn/app/webroot/uploads/files/4875368735.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/nunelerapusotagikolilafo.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/filifivotaxufuruxi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcda464d9---97750860907.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/wetabodew.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/jagefiguximijenudejuli.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kekofijetumufuridozejojeg.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/10655705899.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/23627709144.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/delelotezuw.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/96118289148.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/kupanilatepeposabavijad.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/puzumikatebiwufebeza.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/rumusuti.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/91727308315.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wexanitisogetuto.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/povutotoku.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/28648412274.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nevufonuwevefakepabowo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b0dbfca38a---bizatidukowavixofano.pdfIn PDF document text
    • http://tzsunup.com/upload/48361747646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=women%27s+equality+dayPDF 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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 18156 bytes
SHA-256: 854c4ce31536221b7b09708cc206fb6e7b25f49fdc430fc4031ea8a5b3f7d5cd
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 10696 bytes
SHA-256: 8afef909112ec6b30bb4bfda82e799787eabf844c56b37c1b120117fe301d695