Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64a964a8eef9752…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 05:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb3a72663a08d5645694e35a9a92daa6 SHA-1: 160a3b46a3bf1a60da903bd58ef58788d5b62f2c SHA-256: c64a964a8eef97523b5d24bb450d529bed0d410de48ed7b28d09b67a77468282
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, 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 distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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 https://cructi.ru/uplcv?utm_term=how+to+watch+sooryavanshi+movie+online PDF link annotation
    • https://edgecs.com/documents/14469300661.pdfIn PDF document text
    • https://datawire.gr/files/files/rawegaxaf.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/20798868593.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/bajijoranabubaz.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/93710683652.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/biledakupefadujokago.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/vajafero.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94765348664.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/39690708652.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/8701265603.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/4720448640.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9894ea3f5f01817c55cc78b761927b47/lixonakezewagunatawuf.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tapodapunapuvipej.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/9032729160.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/11726533178.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86058302673.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/91624868047.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/refow.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/58458830701.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zonajuned.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/retaxalabuf.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/zoxizetos.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_EFE92BECB24E83B2.pdfIn PDF document text
    • http://keitbg.com/images/files/73859972860.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_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 14852 bytes
SHA-256: a6f4fc2b312144e148c4fb9f1993b496daab882c23787a8ccb4090d2a30347e1
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 10752 bytes
SHA-256: 1e5d10a3fafe31828af092d54388751d5b0d56ac4f069fcd30536d178ffc97cc