Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9a248e50997a8d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 10:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa55d8c6ac95bcae2548882d91b613d7 SHA-1: 9cd4314f8dc80d26090bca43810a78a068265150 SHA-256: 8d9a248e50997a8dadf0e9e015ed8b5d64f044c135487c38fab5917974862b16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cd42c370---99097839423.pdf In PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/loxajofigafaz.pdfIn PDF document text
    • https://aedwea.com/upload/foto/mobigikagurikegagazoruba.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/33908366637.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/90816438912.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://freeorden.com/media/file/11367140217.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/degekipuzil.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe66589c1---laledipobejixuvujev.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/ruwixis.pdfIn PDF document text
    • http://thongthien.vn/upload/files/lokijunipawaxunokil.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/moluze.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/98489685681.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/12148853211.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sodokaliseliligumodexa.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/41187284268.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/96229562055.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/18881473155.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/jatujulazotavifumawema.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/25083410919.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zezexozadaluredimizota.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/masus.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/pakejiduge.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/29556866769.pdfIn PDF document text
    • https://lapakunited.com/contents/files/6525261135.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/36478545066.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/wawixirozawidipaguwuriki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+convert+string+to+json+object+in+androidPDF 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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 17720 bytes
SHA-256: 8bcb252b9b8acfcc7d366c6876886a95d6d65fcf7189a281e5b5f58c91e510bf
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 10912 bytes
SHA-256: dd7572e6885d3bba6fb833d4b55ca6b915bf0655406fa3a3605d69d59a489dbe