Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fbb328c2d9d8f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 18:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e2a9c3de6715b8eeeb127a84ac513d8 SHA-1: 8b4b4974ba26fbca9b9b68bad0e7018ef383f7b5 SHA-256: 49fbb328c2d9d8f5f135bf594b8532f977871ebd06354d4403a71ecc886751d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, with many pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious intent behind a facade of legitimate-looking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://factorysales.com/userfiles/files/73567469530.pdf In PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/73565079639.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ramoxofaludusefed.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/55323399388.pdfIn PDF document text
    • https://termoformat.md/img/files/4311824568.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vifazopunawakalexa.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/dibisusomobelujeber.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/87473538444.pdfIn PDF document text
    • http://iknow.pl/files/file/sofupewukajudorajisut.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/zapotulukujorig.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/76997210426.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909132935.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/golemituvagejawelapa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313cd1b7d94---1576629806.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/55374011955.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/wererokaluwodu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tapojateru.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/nobijategezowiwi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/71173759371.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/73154111079.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/14587921002.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/37704926714.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/rogujumaxagu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/10730881512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=organizational+behavior+robbins+18th+edition+pdf+free+downloadPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/63747226744.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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 11412 bytes
SHA-256: 806fd06c445adafbdf78c07f68a049ae742fe9d38ffaab0f37742b4ed203a686
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 18696 bytes
SHA-256: dff3801d6138442b278f32e68b8a69b26f8c5e86f4ba00e030b821f3276924e3
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1