Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ba278a4de1f8d5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 22:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29b41e1392d86aed4f86c991a649a842 SHA-1: d79ec1c3a9ef929ac4261e4968eef425f93b9aeb SHA-256: 76ba278a4de1f8d520fe3acc8af28e3d8b26f4a490c39d3aad7def95785df372
94 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts with few links per host, suggesting an attempt to obscure the true malicious intent or distribute content across many low-reputation domains. The presence of many unknown reputation URLs supports this.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4395

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 http://mirai-kankyo.com/userfiles/files/pufowigojemazifakatoze.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/dofifawitizumaru.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/toruzasisukavisitovodofum.pdfIn PDF document text
    • http://esistore.be/userfiles/file/94770480872.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384ace8bfa8---wusokarebiluvifaximon.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/pedopi.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/wodigutijomanolozem.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/lewefupuwufowawowa.pdfIn PDF document text
    • http://kezheng.net/Upload/file/rivinobuxuk.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/waxev.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nakaj.pdfIn PDF document text
    • http://benetalent.com/upload/files/65368475061.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/97041308579.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/65281366193.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/44541876198.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/dotopadilosezemududewib.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/5105373664.pdfIn PDF document text
    • http://poultech.net/d/files/20948461527.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/refit.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/juxaxixamobibofesi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1dbc5ab8764c93d4e1698ee538c9f449/kufafajitimuwopifarilin.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/26704124533.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wosofatizokeravujofozit.pdfIn PDF document text
    • https://cncunse.com/d/files/pagapep.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/67183638602.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/19834640733.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/69992541256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=convert+android+app+to+ios+using+phonegapPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 18140 bytes
SHA-256: a57b1adc756f94f5377495240de6c07cd4558187c0d32341f01cb67fb36f8fff

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