Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d484b084ea97982…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 08:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5631cd9117926a00d4b49d32606d7d86 SHA-1: fc8eb1f5cb0c465aec43e170d8a7a610bf3d6137 SHA-256: 4d484b084ea97982bec4415ebe15365aea4593d23fa18bfb77fa3a1662128cff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit user interaction via links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909133145.pdf In PDF document text
    • http://matsusushionline.com/uploads/files/47455276803.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/wariwaveziku.pdfIn PDF document text
    • http://rld-carbon.ru/file/nitelidizi.pdfIn PDF document text
    • https://cet.sk/res/file/pekunuzelorazutor.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/povude.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/gazozupubomagel.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/lubarotofawedabag.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/58440692173.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/jeretazuwurabopijopamu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21282280968.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/32764896079.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/podubolisikofadeto.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/povoronakofudaxitorena.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kalekiromakogokir.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/29893975139.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/gusipopivijufuvazajosev.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/48772120632.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82850923120.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109070156251992.pdfIn PDF document text
    • https://majubesar.com/contents/files/16011833082.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386efb9d858---rilefoxires.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uvau6vvirkrhclukgcsedlta32/61647244023.pdfIn PDF document text
    • https://irantruck.ir/data/file/javuvimijigogonefojosem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+emperor%27s+new+groove+full+moviePDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 17356 bytes
SHA-256: 827007daecd5689fb282e7e1e363884767e561f88abdeb73b5033bd0985b1328
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10792 bytes
SHA-256: 5ac1fb7c1fb12299c44377e51b9366a73bfa0675f27d9117f6b847f02b5ba0c0

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