Malicious PDF — malware analysis report

Static analysis result for SHA-256 070f36336fa70d73…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 10:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 076b6ad2c79402e75650413bf14c90d4 SHA-1: 89a3bcd5c2ecff394481efdf188617812fa0e768 SHA-256: 070f36336fa70d7391f663ae28520ba98fea94d38e92bc3abc1f0e3dd076e245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics identified numerous external URIs and a link farm structure on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=frank+white+fluid+mechanics+solutions PDF link annotation
    • http://minerva-collection.net/files/files/tatoxevefoxijomad.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/39339781003.pdfIn PDF document text
    • http://cartopack.be/Images/file/10432531591.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/womoxivu.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/giwogikojunajofu.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/63330149923.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907135943206608.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gereboselunulevopugusuj.pdfIn PDF document text
    • https://lesura.net/userfiles/file/30079906572.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/78439622929.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/78321724750.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/rotokozupedu.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/worek.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/mukatagozilikupolimufure.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nubori.pdfIn PDF document text
    • http://merwepizza.com/upload/file/33129102771.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/42850330239.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/21698509183.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/81069005513.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/wixinijanata.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/sisozasijufurizabife.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/fapoz.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42260560418.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/10994671403.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e54c2e2c2---14672564432.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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 16640 bytes
SHA-256: 6a7d83b5b9aa2c7b9b9a848bf8774c9c0ed73bbd464d65786879b681eb997bdb
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 10996 bytes
SHA-256: 9d037d979d1fe700950ab427a4be4907280b7001c389eba2e14aff14dbd40e50
font_02_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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