Malicious PDF — malware analysis report

Static analysis result for SHA-256 402b885ab3e31811…

MALICIOUS

PDF

77.4 KB Created: 2021-09-29 10:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2eea76b67a03bd6ac638a0632a88a66 SHA-1: 34d00af35c5369788977e21bfc79c97d0f664af7 SHA-256: 402b885ab3e31811ccdb25a2eda700d58edc492c26c20592aba40d82c80932eb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, with numerous links pointing to different domains, suggesting a phishing or malware distribution campaign. The embedded URLs, while many are unknown, contribute to this pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ideatity.com/ckfinder/userfiles/files/777425191.pdf In PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/rabesuvetoxisusifo.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/38555933493.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55659355439.pdfIn PDF document text
    • https://cncunse.com/d/files/70214417325.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9794d9eb5---tavone.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/65651722662.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/nezubujuvosimofifiguluwoj.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zipexoberi.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/3819544875.pdfIn PDF document text
    • https://energooptima.hu/upload/File/73562766852.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/28910878300.pdfIn PDF document text
    • https://pratham.one/file/80762751161.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/64503858752.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jugamizugapotanipufopota.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/resodo.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/sajezapaduvujemekoje.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/bikutedo.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/11493604026.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/72967230323.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/jonokusugap.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/tixonogegeliterirafewef.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/58062712042.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/74585318160.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/9278812571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+1.0+release+datePDF 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_off0000c4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FF 10464 bytes
SHA-256: 7369bbfb74907aab7085c70f27f337becbfd7c60ae638cf3975f5402e34c0913
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 18872 bytes
SHA-256: cce5ef3b16df6d007eb048b6f31a09d4f7a1b1542f50e4390e9b621d7f0f1738