Malicious PDF — malware analysis report

Static analysis result for SHA-256 401f2d64929884af…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 16:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b0a8a40ab2cf6c59f6885bbbb4564e0 SHA-1: ef6c3d6211e9b5fc873a3a713e50c41b984adddc SHA-256: 401f2d64929884aff29e94d3cbb5207eff77978559f3bb9436f8c2bae94c3ab8
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external PDFs, suggesting a link farm used to host malicious content. While no scripts were directly extracted, the presence of multiple external links and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

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 http://bytip.net/filespath/files/20210922172406.pdf In PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/ximerug.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/nezaduwebatativati.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • http://napiarsaigh.com/images/xesosidoduderariwonafa.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/87666780281.pdfIn PDF document text
    • http://holzweiss.at/xiferoposamor.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10996234016.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/49190275506.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/makimevadugukojefop.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/jigisij.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zulebowunap.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/35441813960.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/48165792005.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/28042429996.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002faf2f55---32964851256.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/69127875331.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/58349630892.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/jekojizas.pdfIn PDF document text
    • http://vucert.vn/uploads/files/sezaz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cbd7e5af00b459220a413af8d2722ac1/govogajozanako.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedejozafematewuni.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/tosaxeweto.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/88060529820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+harvest+moon+di+hp+androidPDF 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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 10992 bytes
SHA-256: 8ed247ea1cf57f1afee17903d3113b1880dd128a6bbf03d157e3df526af73e30
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 15612 bytes
SHA-256: 063b0c2741c664e1e0df54a5ce9fbf450300e0705a571366e4459c3d85738829
font_02_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1