Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dacf4cef9236c69…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 23:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c2c39d0f017934fcb2e4bcaad89bf8c SHA-1: da3f17b6de81a6ca34f2fed65c5cb7d77e1331b9 SHA-256: 4dacf4cef9236c691573a0c50fe8a045857bfea1e27bdd082a5f27d6bcc2d7b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure itself is also flagged for suspicious object definitions, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=what+is+an+api+level PDF link annotation
    • http://cermak-expo.cz/data/files/file/37263970394.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/bodibal.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dusamivudesumuf.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/70969266016.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/jojudijalij.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/79851366514.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/zelizekanuzelok.pdfIn PDF document text
    • https://theurbanthinktank.com/files/48823200340.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904150337_lv4aji.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/41416473381.pdfIn PDF document text
    • http://quranday.org/userfiles/file/daxuvugekudekabakakixu.pdfIn PDF document text
    • http://hidramaco.com/files/files/zalotobepesitiper.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afade26e93---41511940827.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/bipipedaruluxa.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sebix.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77942779328.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/86449891826.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109101114315730.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35092893617.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/wimokidatig.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/76650066530.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/92553320890.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/beveba.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/64173070344.pdfIn PDF document text
    • https://remini.hu/userfiles/file/64547102315.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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 10188 bytes
SHA-256: 28c00cff52a1313d472d206a1ae57e6268ddd9a0501fbbe26c41b8fe92ae3f5c
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 17604 bytes
SHA-256: bcc86b5957fed654598fdc7f05daf32cee3f4deb262acd179a29869d2e675fb4
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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