Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e09698f9f04f3d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8d230012145bf46c1031af26ee8d28d SHA-1: 26e1cc1aa281c614b91091bf72b9260bbe58a073 SHA-256: 64e09698f9f04f3d297b114309266f3ddb259c9c0f44e5dd1e515a360ea0a6fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by directing users to potentially harmful sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c98db7cd---96218654152.pdf In PDF document text
    • http://kahsport.cz/userfiles/file/galudipomalev.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonutozo.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/zirakofabidusamosamazusa.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/kapedobunudujota.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/18488201827.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/56756237742.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/jefaloji.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/viremepali.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/jirajavopojakobar.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/xibenawopebifetinap.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29988617775.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/54409254163.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/zoledirut.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/40899798889.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/lotarosobulidukumulu.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/81954564088.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nawemapufa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5c0587f6---pelupu.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/31697152720.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wiwag.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/19656210896.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/30716128037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=i+want+to+download+mobile+legendPDF 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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 10500 bytes
SHA-256: d14969a40b131baaa5fcb388b0db2afe83f234c9a14676c12c9864fef0442119
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 17548 bytes
SHA-256: c1a84fc5fd83806548a895ab629581574ac67469df0a2b80c534705ee787a74d
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1