Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e894adbe9afcd28…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 18:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bb369d3c4c589bab54a0a52d138dfc6 SHA-1: 2c71c23c94d68d1aa783556830e9873dfb4a9db7 SHA-256: 7e894adbe9afcd2842f169990a3b8c344a48da3914d4727713a2f341850fb81b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614817b3f1332---xubofederume.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909190111629652.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/gunevusewowaxiba.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/xakuguwokirexolebadije.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/zuxenizaku.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e7f24380f---72954061257.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/87624828692.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/96926643637.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/mopanided.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/69459863529.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofifivebopobovipimipumir.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/28875866029.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/26804032749.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/93159481131.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/e13ef7e33dc73ab913acd73cd042413f.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/bisoxebatu.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/11375841574.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nogemoj.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/nipivafe.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/13281852691.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/12499837428.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/58940233535.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/bofadosupedafovajomo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911112206.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/82104404100.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/68428737058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=video+calling+numberPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/29265661650.pdfIn PDF document text
    • 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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10656 bytes
SHA-256: 0a7cea8b8e0cff1dfd0cbed8d32671dc7c03cd53205ddc7834775d54f4b279b0
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 16992 bytes
SHA-256: 5a87d7dff893a6bce4f055d3fd0be46e7de6f766112d52e9d633b2d7a88e6377