Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5c4fe7c375e271…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 09:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 627fdeab258f3aa5f007d3853187d040 SHA-1: d5fd53a2c8221fb4069e7ed89c114c4af538933b SHA-256: ee5c4fe7c375e271d74fc09272e82b6922603951147f604acdec2305faec3b61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct hosts and disposable URLs, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://horvathortho.hu/tmp/50413864918.pdf In PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/ruzevavogul.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/78414000582.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/43005998336.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4igs190n1fnj5n2o7blva4809e/medizaxixokosubu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140e74d401cd---soputopebuweliti.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jonaponuvilafedipotodev.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/55360879204.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/93591113380.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mozep.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/51418468143.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210918131718.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/muxif.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/sigeganuwat.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/38139334741.pdfIn PDF document text
    • http://art-ball.net/files/file/jumuzabuzel.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/xamasexedowape.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/59215704435.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/679778239.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/nubon.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/ziguvu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fevimigidusawijixelefek.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/82828350646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+adventure+movies+onlinePDF 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 17496 bytes
SHA-256: 144d76f894b8779f9ee0e21dbbca30ba0f090c75379329570cad090a88f21064
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10552 bytes
SHA-256: 46a4cedc24ae54273b0dc1b9c24e7312b3ebfaa260c461881ea3f534d39f9272