Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c8c9d03f3bd8f7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 10:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12bd5ccc46ccafdc429b115e4de3569d SHA-1: 713b69f96a89ce9040e22aadc4577ac66dd7bdef SHA-256: 84c8c9d03f3bd8f77886f9cd3257b364013f8f9f07be2d3b05dd2dcf937dfbea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=best+hibernate+apps+for+android PDF link annotation
    • http://runnersavezzano.it/public/userfiles/file/24487336523.pdfIn PDF document text
    • http://gaudi.tw/upload/file/51058279560.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/37448102076.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/zutolenetukalireno.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/40597600107.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/jebonugijodano.pdfIn PDF document text
    • http://npas.ru/pic/file/19215134137.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/19935741576.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/12bn09is7ksu5mddlk923c70n5/nubasukijojuzuxo.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zofimodomufer.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nabetanegigujanubu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/9784205171.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/49675349632.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/79821290547.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/gupagezitiz.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/83695745246.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6t929v71s6cmfpb9jeag0d2ft2/texukagij.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/jegosak.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/24153740362.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zipup.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/wekerurokodivil.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15962520036.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/68791485818.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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 17372 bytes
SHA-256: cb171a2fa4a7d51222f4bc02af8aa2a69c5eeb47b905cd09be5969219f762f83
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 10744 bytes
SHA-256: e99c62fd73f9267ee122282f8bdf7859d14514e3d9f94d7093e2921c65cfe8ca

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