Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b38b16d58db4dea…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 01:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c87bd5608c29d5178207bb774ba93a0b SHA-1: 8ec07ef232e4b108a9ee2d4d54bf01a474d1457e SHA-256: 3b38b16d58db4dea5d8ba3ffe7342691b7523cdc7acb854e23fa9e5e870917b2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document's primary purpose is to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=aladdin+episode+540 PDF link annotation
    • http://stellarvvv.ru/ckfinder/userfiles/files/76783761872.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/14824170258.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zubekeler.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2add47244634bd369e160a567f82a06d/40463038607.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/nojidigeramobukapa.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/bolem.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/nuzofapuwupovalofibaka.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/vezuzimakekus.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/xaruku.pdfIn PDF document text
    • http://c-amc.com/upload/files/bakopofumu.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/49193895873.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tiruzazusagivolerumek.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/vegixobapuvopoduva.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/1053484562.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/sirowuzukowulibivewifo.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/65419372555.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/11372038964.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357c0f5d863---52844692545.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/66119643308.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/457768976.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/87575739391.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipesemogigoxejupufag.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/gezirirabaj.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/14363966639.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 19572 bytes
SHA-256: b263c27b5b4aeb7e00d59a0b410c39a83fbe4edbc3822fadc7c2c13294421438
font_01_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 10500 bytes
SHA-256: 47168dc3c928b8f63d0ada5f753ec92153beb30c3b043e34cf8333617ab1a5f2

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