Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f78d0c828ab3b05…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f15f8f78465dd30ae8d11a16aec8a057 SHA-1: 22ba08be579419881230581707337aeebc4ba0b6 SHA-256: 7f78d0c828ab3b05bd33940c81682a773120c24bacf373df8204786ac0e75a5a
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 point to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination of these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://dermatologie-francophone.com/userfiles/file/60497416140.pdf In PDF document text
    • https://lanjutpt1.com/contents/files/mimomenarovowivu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/9738258935.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/zolow.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/kewizusizona.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/98646520583.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/voravas.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lovam.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210921081322.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210911_234858.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/84490586970.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/xogawiloladelowabadezuzo.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fexileta.pdfIn PDF document text
    • https://pcetravel.com/files/file/gavobete.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/73665514526.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/74232688207.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/3862795675.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/15477692455.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/47081224453.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11276761928.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/65259487068.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/86030952848.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/dewatupo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/98915854733.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/70382238bac0fd143ff3ec5e86fc500d/sidetozesanasexa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161404ad609c95---14919949913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=alone+tyler+posey+streaming+vfPDF 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_off0000bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD48 16692 bytes
SHA-256: cf465a3f9a9f2153bbe5aa7816b6157840b39620cd1bee1a276245a67204acee
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 10864 bytes
SHA-256: 260afa0b4864501369136dbd1d82b06edbdc47cd61b84b1a2b361741b21c14ac