Malicious PDF — malware analysis report

Static analysis result for SHA-256 3587d3ec464e3307…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 17:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: befa9000c5d8142eba99ab7cce964da9 SHA-1: 9ed8f3b77fd8fca9a318fd8d35d072dc0b25ea43 SHA-256: 3587d3ec464e33074910f19468ec12c39e725f5080e3e29a374564f5d6658a6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous embedded URLs point to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://allytemp.ru/uplcv?utm_term=transfer+files+from+phone+to+pc+via+bluetooth PDF link annotation
    • https://lionkingbali.com/uploads/file/27727890700.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/merusasemowu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/8112278100.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ledenapowunifeluzuseruja.pdfIn PDF document text
    • http://sowlindia.com/userfiles/file/56348737075.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/64612659107.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/fubimoxakipitizowakob.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/32678546902.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/doronewulubeputujiwajupav.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/favevawefugopujoguloka.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/21017793495.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/mepukeraxipupakukasugom.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xadopusafizilo.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/25464138961.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/zajimokadok.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/44637166706.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374ce2463d8---logugoritogafosuzaro.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/41984799256.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/41360593850.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zagodazufimejuranigeze.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/likaruxabig.pdfIn PDF document text
    • 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_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 11016 bytes
SHA-256: aa430676b0a797dfee6a4bd558977b0bcd5a3590edc28393d33be3f4eaa6bf3b
font_02_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 17152 bytes
SHA-256: 329baa3ecdd5747a80f3c305ea12c94fed1f76ddad7f9a799b70ef5bbbeb5a83

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