Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8ef89081fbcab3…

MALICIOUS

PDF

91.8 KB Created: 2021-10-05 17:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e7680624685e8a455e84caf509a7293 SHA-1: bb8e4e246c47f6fbd9a385bd61c1d04d06c91d84 SHA-256: 1c8ef89081fbcab32bb4a45453e51fe29c52bba304c0ce261433f374654f831d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to obfuscate the malicious links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bdpq.hungminhits.com/files/uploaded/files/tuwujojaduxot.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/20270496359.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/6675711653.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nemaberobonojibolilumowam.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/popawobixi.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/80288056857.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/81376158547.pdfIn PDF document text
    • https://lordoptika.hu/files/files/55222715537.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/95838891080.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/54603020908.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/30249761762.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vokodixowiponofibufu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142972de1de8---nedokofigudakujaxawuwopi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bbae191fe9d2a7dd21601db20066a0cd/99475148736.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/16518765831.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zarokigaxebojakijibibag.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/87679689851.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/7422514664.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/dixoremopozenavum.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/35017933358.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/91743193200.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/jugopozido.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/79771371145.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/koserilevuzoxena.pdfIn PDF document text
    • http://hflchw.com/upload/file/buwupeniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aikido+solo+trainingPDF link annotation
    • 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_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 10364 bytes
SHA-256: 99d5434d1b3d1f2987fe9575f0fa6d60c38609367cc2f868d521d24bc378ec79
font_02_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 19448 bytes
SHA-256: 585a9761453bf87e1f7d77913bfff0ac7557cf21896e6912f9a31ca8ed0839e3