Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e70bff8873c535…

MALICIOUS

PDF

69.6 KB Created: 2021-09-12 00:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a1b92f37174786d98a2019db6c8821e0 SHA-1: ad2788d27899246c5bc096a105789382ec56792b SHA-256: f4e70bff8873c535dcea7a691757222b4b29b776eed87cd35510253a5e17a394
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/lojuzuda.pdf In PDF document text
    • http://www.rpv-drachten.nl/files/file/10099186286.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/pelutegonegejinit.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/togegepivobutuvokilop.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/99182652941.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/xobaxubopexisujelude.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/zakepox.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120616591597.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xolubobokanijudozifozo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5588a6b7---92640959908.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/larerokam.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210912060103.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63891867387.pdfIn PDF document text
    • https://betsin.org/userfiles/files/35429915045.pdfIn PDF document text
    • https://webaprint.be/img/file/58538197030.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903060833138478.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/45968714339.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/60818481151.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/mapoxipozewemavamijar.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/nojelajebu.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/zagunokavoti.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/visuvubudegi.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99129213665.pdfIn PDF document text
    • https://arendic.cl/files/manifutala.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/984cdb712bb65023e186aafaaa7971e2/ratogetisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anime+online+app+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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 10120 bytes
SHA-256: 53c74bbfcf4da9ae28cc451d3583c4a103d31785b53c27bf344461985197007e
font_01_sfnt_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 15772 bytes
SHA-256: 52e766603db0d9e1194f9e468503a00eba8e115d2c0e2273bd92d929eab5a125
font_02_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1