Malicious PDF — malware analysis report

Static analysis result for SHA-256 952548638811897a…

MALICIOUS

PDF

72.5 KB Created: 2021-10-09 16:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a57f7bdf629ec263acf65973e6d18a79 SHA-1: 14a55d4f9b274006e0f50a74fe88f8f94b89c763 SHA-256: 952548638811897ac81dc2d93b3470bffc2b32a52081aa6e8cd1f2b0495843c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or redirection attempt. The presence of embedded JavaScript (T1059.007) further supports malicious intent, likely to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vntdc.com/upload/fck/file/87659327806.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6a57gqtcn202lrbe332ggsat96/92043570310.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/kubugururadejewasokezuneg.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vadikisaj.pdfIn PDF document text
    • https://limsurempat.com/contents/files/sowarilonof.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/luzamekakufejabonuko.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/rofiwedopipovoraxesifid.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/50191672240.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/33260030102.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/dakapu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/85682528690.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/50093244343.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/jebirabukixuf.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/zagixefuwatijikixotekut.pdfIn PDF document text
    • http://kccmaul.com/files/files/lononatiporo.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/67405541687.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dapiduvanagapelagexeva.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/50726016895.pdfIn PDF document text
    • http://woykoff.hu/upload/file/gafawur.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mogodifisir.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/57028350409.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d4cce711---mepevemijemifawemajok.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/48587428356.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/72424164671.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/53116753375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=countries+in+recessionPDF 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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 15828 bytes
SHA-256: 03bc0d756db23c0b1e7755db78e9acdcdf00e4829753503669176fb949378d19
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10148 bytes
SHA-256: 26daf79b90ae9f3bbaa1998dafa90e9e233bef4ef938b811b1bc92b4e6f4bf20
font_02_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1