Malicious PDF — malware analysis report

Static analysis result for SHA-256 36579acda1fedd77…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 07:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 917b6609f6894c362b49ccad791549c7 SHA-1: e837f4fe5b001e589ad7df540a88881de3a3367c SHA-256: 36579acda1fedd771442553ef5d0245973d943deb55d8bc86716ef537ab58bf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.miyadenthai.com/image/upload/File/80906554352.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/20821971697.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/bokelebipuj.pdfIn PDF document text
    • http://biosite.ru/images/news/file/55586505011.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/roduporaxo.pdfIn PDF document text
    • http://proxima-online.it/public/file/didaxanejas.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134e027a24f2---nazemexubasanimepivo.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/vojere.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/8489297783.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/9128236900.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/13278112482.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kokofonevixerurujogu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/88536248848.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/nigurejebuv.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/xebelokovegujuruv.pdfIn PDF document text
    • http://baove247.org/upload/files/42290257631.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tutawezij.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pixureku.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/38211698011.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mibewivinobibatibub.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/84047575040.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/18073273718.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/19245965442.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zujuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=maze+runner+mod+apkPDF 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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 20044 bytes
SHA-256: 46861342e2ce6a10f2d9af25e2ffb8a0be07a84382e5a11b99b6bd1a48ed2ad7
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 10396 bytes
SHA-256: 148ed5893346f95baccadce79d51da610376bfe1fb8637ea665013aced315928