Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc93deec19d5810…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 12:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 890604137b5c3f3273b69d88c6b12909 SHA-1: 05af7f10c685e5ca6839e01c2095e6f58dc902bf SHA-256: fdc93deec19d5810271461bda7f3e74de30fe87f709ff33059e92f0e9187b9c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.confirmedtour.com/files/8834184034.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/25869116978.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rokematupi.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210908052851.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/19232660310.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/golepidafozezisirusugo.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/kavukej.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/67135765856.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/15783174806.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/23384762242.pdfIn PDF document text
    • http://wdnederland.nl/file/nolejiwesopobavebuwarafup.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/64716168817.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vonuvatulexejolanewoziwol.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ea9f0569a5fb4852e548e03482779ee8/86451125935.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/jepajibedamedop.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/zifofopaf.pdfIn PDF document text
    • http://saaretravel.ee/images/file/78836882789.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/10893337223.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vagoximiziw.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dokisobazelozobusudanumom.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/95108553899.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/logupimapi.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/1188273531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=is+74+prime+or+compositePDF 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10304 bytes
SHA-256: b56bd102ef5923e229958a0ac06a35c842fc8cd60d83ccabbfbcc146f9897a1c
font_02_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 18420 bytes
SHA-256: ade65a70e85a04fae4936cc12fec506d578094a799491d259b8978ce0763b84e

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