Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b37b46ab12fb748…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 21:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af58dcd6ce00085a252e6b10039f13a0 SHA-1: 6c4467854df1330441bd1325a6a7dd8eb73b0d7d SHA-256: 6b37b46ab12fb748435746f2adf4d869a2bd3247058179f0dcc1afd0bfcbf604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=best+vpn+for+android+free+download+apk PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5199f3a540b9df212508278c61248cd2/44848732706.pdfIn PDF document text
    • http://leguido.net/files/23309206875.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/raputumakenixugimi.pdfIn PDF document text
    • http://shophouse.info/images/files/zapujawifomur.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/xakutanizimelukadoweraji.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/60076041107.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/faralo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/83642161414.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/nixakebi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zowapojuwefuxape.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/tuwajezixedezinewimo.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/lekakadadur.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/29762201246.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gowekidugokijabeza.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b4826c9---78631518525.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/kasuxafut.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/22737497013.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/88707742370.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/mozafobiwarolev.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10788 bytes
SHA-256: d6a3aa3cae7790831318937953c5b3f343b3e3cd45da1c4ac383ab4be4e81ca2
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 17320 bytes
SHA-256: e01b36f43eabd35855e9e4ab0184729d769121e2f3ac237d55c74f7df8d3685b

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