Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd7dfa98d6f4feb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 13:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 426bb0d82bb691e785d58a0f91a53f2a SHA-1: 774aef2e40c5a6c6b9cacd0d37f6c7e3bfd02578 SHA-256: 7bd7dfa98d6f4feb26de806fe1618a538699486d95464c2c7b469845e45b0de0
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. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to direct users to malicious content or phishing sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://escritacontabilidade.net/fotos/news/file/70029374465.pdf In PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/zopakig.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/39167247854.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/liwozunopedisakoxipisude.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zeluravifotelanik.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xezukewutatogeluxasewek.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/85428801404.pdfIn PDF document text
    • https://koratspring.com/upload/file/10083092514.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/96860604861.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/63265341116.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/66977208824.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fazija.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/85973269177.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wefilukakogomemamujazo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/65697090611.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/15600241301.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/58596364611.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/78101031317.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/putesodivafolaromebojiju.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tulewid.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/lasobuwububevaxox.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/39559671496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=higgs+domino+versi+1.61+apkPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 11024 bytes
SHA-256: a6998a0b749664354a6e52bc0573e140813f2989093f5ffe00eab740ed66ab92
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 17092 bytes
SHA-256: 286dc5724438a1c8549a9cb24e7588f1c5f0d55803f1eac2192aadbc1680e95b