Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f066faf85c4e2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-17 03:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 327ec20685811d54e50343c067214edc SHA-1: f4f0cf968af22686b804e3ce45539df1580cc3b8 SHA-256: 245f066faf85c4e295fcb1de794749e789450b388fa5c5fda737ad72a2efe7df
124 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple distinct, disposable domains. The presence of numerous unknown-reputation URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

Heuristics 4

  • 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
  • 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://digitaldaya.com/imagenes/file/63489758258.pdf In PDF document text
    • http://invismortgagebroker.com/images/file/20657996401.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/gedikukozuzifanagulivif.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/48114812423.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109151646481291.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/46067534642.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/jifowojupusarud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7f33b26---96322683906.pdfIn PDF document text
    • http://mdtrend.hu/files/file/79501393989.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/78778977982.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wipolomedigisujagafefari.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/kiwijavufakonameden.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/fukigifosanexikaxarun.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/13945510336.pdfIn PDF document text
    • https://aitalk.vn/upload/files/90985278484.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76085935092.pdfIn PDF document text
    • http://furniture83.com/upload/files/fivutuwotugoruxe.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/85031728323.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/72368293956.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vumugizadujewekiwezodij.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/61028669393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=praying+mantis+kung+fu+pdfPDF 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_off0000b159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 16196 bytes
SHA-256: c6f4cf3635d8485aa9721f45b347088e0e47be622f5fa7f5415e41a87b45e709
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 10848 bytes
SHA-256: 0087cfaad9b01a3b0aca7543e16360e14d290e3cbaa816da0b3487b5a96dd173

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