Malicious PDF — malware analysis report

Static analysis result for SHA-256 5007a9ee48be8c8c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 11:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8748cbdd68434a756f3b27949bf633e0 SHA-1: f4e78afa41656ac9820e201028d75554a1603df0 SHA-256: 5007a9ee48be8c8c3be164f271f01f73b47b7f7f0e7ed1cc6c139aba55ae36ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://barahi.com/assets/userfiles/files/detofuroliju.pdf In PDF document text
    • https://henseltech.cz/userfiles/file/25942444819.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/98949844779.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/jazilivozakefal.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/pixezokoxaxoxugifonojoko.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/57378696833.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109052148075834.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/losofigokixepaj.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/zososoxukawuxosizeguxo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jepubi.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nekunojobanofunobemuv.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fff710ca5---ronuwosavixezekowazaxova.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xogulomaluginuzawixekef.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/76987028634.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/63605639735.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/94833585902.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/74120344403.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/68977306585.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/32745757502.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domorunalobalekakozom.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/55895908368.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/bazafifuzago.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/7861252861.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383e41e570a---25016602569.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/jarijubigalobilalazexanu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/muvavepu.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/33057155834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gallery+ad+free+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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 10156 bytes
SHA-256: a027af8bcf80aad654f7f6496e71e34da7d49cf21d365fb421fc25ef1d924520
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 18268 bytes
SHA-256: 24c8f44ecb87dc5d1a3f8ae2ec65da2b78737126e2ffc37b12df229b76f1de93
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1