Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57099868125e7f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-26 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dda18eb7736b36040b6891a0b56d8124 SHA-1: 89490124abda22b294283dd9da8ad306fbf9b1d5 SHA-256: dc57099868125e7fcb8910ac65281a672b17d86611e5fc71d0e5d022c1f55695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, including a lure for downloading an APK. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ardennes.proximeo.com/ckfinder/userfiles/files/xazuverimuguxodakad.pdf In PDF document text
    • https://badoza.net/userfiles/file/75622531649.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/82008133580.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31935268800.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/gotiwatukifukalepunex.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/voxomomopukil.pdfIn PDF document text
    • https://mkontroll.hu/File/23515556805.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/75454407627.pdfIn PDF document text
    • http://umhouses.com/uploads/files/torowadav.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/bexewutebuja.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/dolekefinezemasale.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36196445868.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/gutiziduxinuv.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613177b08d63f---30616884695.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xaniluvebifepul.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/71399090056.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/zabumifijevojixolixaz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b1dff9bb18cedbb7db52c421db0caec6/47352979672.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/82109170185.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/22891880101.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/xarozepovofobuxudig.pdfIn PDF document text
    • https://photojet.net/userfiles/file/jutemopifa.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vupazoloniko.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/dejejupejejotavapeniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hago+new+version+apk+downloadPDF 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_off0000c16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 21028 bytes
SHA-256: 067dfff17ba23a462011826f71433c107146cfc34b02ca048cadabcc2c3e47c1
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10704 bytes
SHA-256: cca3dee2bb1bf2d51aad363b720a1f6d4a68e27ce22d19858b4509afdb0b3f79