Malicious PDF — malware analysis report

Static analysis result for SHA-256 122611b6eb7a28a4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 10:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa24ba6b086643b851bff51bce8d69b8 SHA-1: bc53c83f73814bc7a4b3916312bdc160db7ba40a SHA-256: 122611b6eb7a28a4401269ce15a52c83d614a07a544b5bafa700e85803e74010
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The presence of these URLs and the overall detection suggest the document's primary purpose is to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://toolsatool.com/userfiles/files/wojudududozix.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef8b45a59---buxitabozeguvapunuveka.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452a2b5f74a---54994032612.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/7310385968.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/82951820815.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80356407734.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/72517233312.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/bitogononeripixiworoniz.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zubasufu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumikanolelubidaposo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/rokekelutukumapusorexagiz.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/lepujagaf.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///sukuwepu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vegofagobile.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/49346976500.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/63976932008.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/duzugu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73186474233.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/85556470336.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/66594198290.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/22495358686.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/99051110098.pdfIn PDF document text
    • http://dytac.hk/userfiles/dulisekewav.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/sewobekava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+android+app+to+drawPDF 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_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 17276 bytes
SHA-256: 350efc907abe5f902b2898a4ba369daff0c8446d2f21a691f4e0ca5038de27b1
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 10480 bytes
SHA-256: 42ed95b17f45fd00729894588a359f5a88c9947d9ead1a33207462acf0f321ea