Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc29ec46eb75ad…

MALICIOUS

PDF

68.8 KB Created: 2021-09-12 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8948e6cedc1fbb7720eed5f86b0669ec SHA-1: f8b9246e413d35d2dad0caff86e7b1feb1236e2b SHA-256: 37bc29ec46eb75ad148b4584eb6de94544be4f200427bfe48425924d95a0840c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to redirect users. The presence of a link with a 'utm_term' parameter suggesting a game download further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://liweisteel.co.th/ckfinder/userfiles/files/17156058567.pdf In PDF document text
    • https://ksi-system.pl/editorfiles/file/25907046426.pdfIn PDF document text
    • http://skncn.com/u/files/8378943346.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/18307331138.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f51c1588565418b75a9d5d6537f0dc4/84687194754.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/jilumagajojekugimegosa.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/15246597601.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/17444735731.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/bupezu.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/degaporune.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/duzixeso.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/64473902183.pdfIn PDF document text
    • https://ottopianos.nl/files/4919077235.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/24714285000.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/xinuferaxejijafobixe.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/femuwilugasugofo.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wumazizowozisub.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vusejupiduzemuzo.pdfIn PDF document text
    • http://moretonassets.net/userfiles/najura.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/latazi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/lopisoxoroz.pdfIn PDF document text
    • http://salwex.hu/file/zobatevulomijesup.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/lukuvawakagukebexizoduki.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210908060808074759y8kojy.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+download+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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 14244 bytes
SHA-256: 2721c919e84df4a132f580e8318d87ca810ca24c767ec4faad45570af8e8abde
font_01_sfnt_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10368 bytes
SHA-256: ec621d65ffaf61e6ab8bdf4318d7cf00d419c9a4c735cfb45a1954b4a5ca6f53
font_02_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1