Malicious PDF — malware analysis report

Static analysis result for SHA-256 4979b087023ad55f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 06:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cf2f8d3d742cb5fb8ef325dc1ecc3e8 SHA-1: 192f24f3f0388521d25b414ef13c7a3e997bc51b SHA-256: 4979b087023ad55f31ba42c02f9471322b25238294670c7a938499ee59373da5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+to+change+storage+location+in+telegram PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/jibagaselivizizomuzabofat.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/zuzerudazuzalojidetizok.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/womigunamub.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tibuzojiniligizisabux.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/xavubegodolukozof.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kujozaxus.pdfIn PDF document text
    • https://shevian.com/images/file/varoletuxunadipumag.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/34292432161.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/44088349028.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/52488534666.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c4fe51009e4f216915edb61791075ea0/9663201457.pdfIn PDF document text
    • http://neteyes.eu/editor_up/23837137002.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387508e1b8d---20985724564.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/15690117202.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/77953768990.pdfIn PDF document text
    • http://runhouchem.com/upload/files/10931826084.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/jazigulimipenusekefetepeg.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijexivigewadujob.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/32948993660.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/90335119954.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_031814.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/fonorufab.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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10752 bytes
SHA-256: 38fc416d2e24f68fd01577a32e216a9edde6f5af8a32a873bd0273d768b6d146
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 17600 bytes
SHA-256: 66ac469ee9aed4bc81175bf7061bfd770bd92b8445a7d6d6a8d2f0f260706726
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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