Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7418f6a2fb6896e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 20:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcf9fecdddd7ba415339191dc6fa0612 SHA-1: c7223660f2dc7262f648e6f2a1dca793d524ee87 SHA-256: b7418f6a2fb6896ece156c567fce16d869cf0cc099aaf1001e0d615fc2e7c8ed
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are part of a link farm structure, suggesting a phishing or malware distribution attempt. The presence of a URL with 'download grand theft auto' in the UTM parameters further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cancelaria.pl/galeria/file/nukokilu.pdf In PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/nonexiju.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/56413850215.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/40359150047.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/nakoxinivekefe.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/fibasixaguduwawigoratoko.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/50048033227.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wafanavelajidotipimo.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/tizab.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161307c1facd78---nudobo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/62499354869.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/gonabipunaziv.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51aa6a2e---7358697426.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/41355042335.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/nasoxu.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/saxinopevizunujoxodo.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/jameperekodulupeda.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/febefezuwewogafopelup.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pazukebusatasufe.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/kekem.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/43417230716.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/33427233532.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/98445893767.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/88667717946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+grand+theft+auto+for+ppssppPDF 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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 17448 bytes
SHA-256: ea0c9075054638dd39331e2f322af7bac3bf1abd19d13ee80d95d911b7e2f701
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 10872 bytes
SHA-256: 7ff5b4914f0334547ab0763f0df1bc0c267ef8ecf4cdee5e81e2a94739a74d4a