Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9961b1079d98196…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17b4eeadb7779bd4e6e2b577af05e549 SHA-1: 1e323d50e1805aa0fcc472276c7c91a2e8484855 SHA-256: f9961b1079d981961b61ea9a13b32409708b0f4d9ba395a78a8ab4d76105cdfe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some of which host further PDF files. One heuristic specifically flags a clickable URI pointing to a raw IP address, suggesting an attempt to bypass domain-based security measures. The presence of multiple external URIs and the 'link farm' characteristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=dark+web+hacker+apk+download PDF link annotation
    • https://beysukonaklari.com/ckfinder/userfiles/files/9874551529.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911025507_1034102331.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/bepapoteg.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210913223013.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161410d0d90b5d---vugidexelizosokagowaf.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/jikuzosuborilepanope.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xezofipekijunukekinezed.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/xuxil.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/segelizomifipam.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/644807989.pdfIn PDF document text
    • https://gilbertems.com/videos/file/26315118483.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b464d0c4a---27492414350.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/87337220374.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/91399490537.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/71830939577.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/jevemiwetokenano.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/50110724364.pdfIn PDF document text
    • http://rubensova16.cz/files/file/wojugiwifadi.pdfIn PDF document text
    • http://cpviettin.com/upload/files/luzobuzaxisarogipamati.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zewelosaxo.pdfPDF link annotation
    • https://grootformaatspandoeken.nl/userfiles/file/xumodenaxanu.pdfIn PDF document text
    • http://linker-apps.com/files/7286543385.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/sipakenomomabitoxux.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_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 10572 bytes
SHA-256: 5153ac09f28ea06bb6fa776ec8767494fa4b2dc0b2ec4608bd68cb51094e7b0a
font_01_sfnt_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17524 bytes
SHA-256: 273aba6fcd1319c0cf45254a048716eab4ec3670bbaaa487a8fd0e0f6a3cc22c