Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e807db73fe1cb03…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 02:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9797c3d607f3a6cfedbbd373fc60872e SHA-1: 728e84536c6be4c91069775e53f95e7af736c667 SHA-256: 6e807db73fe1cb0391ce38f3ec01857b17bb508002ab557ac6db409f180b63a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=all+about+the+benjamins+full+movie+free+123movies PDF link annotation
    • http://jiehuist.com/userfiles/files/dinosexe.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/91168477380.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/rawuzaw.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/givadaraxusiruri.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/notalatajutipowuxata.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/31554768428.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/kemekug.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73104073286.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/51824550156.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tarepuxinedokegafigeres.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nobakalugufobiwifafozog.pdfIn PDF document text
    • http://goldmustang.ru/files/files/35913192101.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/35442769876.pdfIn PDF document text
    • https://koratspring.com/upload/file/wewufidove.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386594b9e31---30013348671.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gawusugidebar.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/pugenomozeje.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pipoga.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jupevaroduzek.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/nobupanikijiteripopipel.pdfIn PDF document text
    • http://berbun.com/user_img/file/14324639602.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wigosob.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_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 17656 bytes
SHA-256: 835188570113243bcc032723cb411245d2f73dd090fb459fb49a9abf0305bce7
font_02_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 11240 bytes
SHA-256: 21fce141c06467c7238d45ff3387dd5e4f89011ae542dac32cf5985f6f23e483

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