Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd850a057917f2b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e8ce8193c4f5e16d849f4c3385e4a9e SHA-1: af6a8068693003dddf541c3aa4ae667ee01d5eff SHA-256: 9cd850a057917f2ba89b1473a9c489bb98d3a1cfafe11ce7d121712232c1cbe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, with one specifically pointing to 'https://irlanc.ru/uplcv?utm_term=install+android+iso+on+pc', suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=install+android+iso+on+pc PDF link annotation
    • http://manavpublicschool.org/manav/userfiles/file/26251617518.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/bewazijuwokafugoz.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/35202517306.pdfIn PDF document text
    • http://vswet.ru/f/14835776195.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/44716870517.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/14017370017.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/10576484198.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/05/tesilupimuwor.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/bafivokojavatubazuv.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zefogoruvuriwajipiwijatib.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/27313392080.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/63524834839.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jipugijemewijawimixonero.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/9453332243.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/pigexurugoxol.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/60782165397.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/1825023324.pdfIn PDF document text
    • https://penzion-palice.cz/content/gakita.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomazejode.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/tagobipotojamibubezibut.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/perogere.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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 18336 bytes
SHA-256: c8f240ac4ac77f39daad67d23771ed0657843a8dd1b091c24821f406c8f87e9c
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 10328 bytes
SHA-256: a88f567af5a565c0d6629248e6b13d429d5d6d77399cfd7a3caa60380f77466c
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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