Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dacdc65af16c155…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 08:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf94a6b0868071a0404d83dcd71adfde SHA-1: cd2e74f34d57f42069a1b045dd74186b73ca50a2 SHA-256: 3dacdc65af16c15552134352935e6f44c148b4ecdeffb641b1a41d5d8389559f
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a PDF document containing numerous embedded URIs, many of which point to disposable hosting. The ClamAV detection and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4597

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382b502b3f5---49186359941.pdf In PDF document text
    • http://wxeina.com/userfiles/files/88902592579.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161480860134eb---divovariloludiselut.pdfPDF link annotation
    • http://transportdiverse.com/uploads/files/8899296881.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/62009464072.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tukapotajolulufumun.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092113250023.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/kefezowozifokomikepepegu.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rosexulamuzabowobatev.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/31473574894.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/bejebo.pdfIn PDF document text
    • http://metall-press.ru/files/94123880409.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/1970136246.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/19447028948.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/50789296008.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/mosimogiforev.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/34115157817.pdfIn PDF document text
    • http://turatabor.hu/media/niwasuvimutuzamugebit.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/wujeresegi.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/37378398774.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/27628056625.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/26321977239.pdfIn PDF document text
    • https://curvy.tw/upload/files/rajulekebawonakunig.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kotivikugebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=di+di+hollywood+movie+online+watchPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 17596 bytes
SHA-256: 56ecff13cbfdbc345f42041cb3d85d947807ac901ff6ef46072d1240e4440550