Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67673479434a266…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 03:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db786b87cbb9f21eeda8f2ce9a91193c SHA-1: 43235a06b6478186b2b497bd62f42a13da3960d0 SHA-256: f67673479434a266499f1ec891cdf6e4ff10f1d6c36dba7fd19e8f14b281430d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to suspicious or unknown domains, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/64997161933.pdf In PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/13955281658.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/puzogipobow.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af61e73527---lonapetimapotomiviniwin.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xevatamonogogajedowevavi.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/62729216521.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nafumobawofemuvepiw.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/79197016180.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/xosige.pdfIn PDF document text
    • http://webursitet.org/Files/file/64043837827.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/36572605320.pdfIn PDF document text
    • https://heureka-cz.eu/files/58863464493.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/73225684368.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/samirajinerasezemag.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/mutitomevidajogoxijikulav.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/nikun.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/pevodamifijebuvinafid.pdfIn PDF document text
    • http://vkts.se/userfiles/file/nonikapubutijal.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/besarotamelatuba.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021921535200404.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/suxifakufiwarudakugijegad.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/22169375773.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/17783800608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=use+wps+on+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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 10332 bytes
SHA-256: 69b6262f3c7b483a7d7863ab5b2f9f9b3514d0d1db4350d9ffe6222b92ea967a
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 17152 bytes
SHA-256: e23594f1d9e3f14f8169768ae50126d410fe53ac8193bc2f75c6a4309d9fcc70
font_02_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1