Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2ad9e150bf8b51…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 08:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38877fe8f1184c86b6bd9c9cc43b1f69 SHA-1: 7c7ef70105dcae28588bb8e879b1400756ad86fe SHA-256: 7d2ad9e150bf8b51c238e66c552e393240700d3b64bd5a4a6ce430b277a45399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or link-farming scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially disposable domains. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=mugen+train+full+movie+sub+malay PDF link annotation
    • https://mygrind.ie/userfiles/file/13134664222.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/fedurozujen.pdfIn PDF document text
    • http://samtekelektrik.com/files/tewixusab.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/77043347144.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/mekazuredupotumid.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/81000225834.pdfIn PDF document text
    • https://olterus.info/contents/files/zatopa.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/25498732551.pdfIn PDF document text
    • http://rhondachem.com/d/files/6764929874.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • https://0900107678.com/upload/file/86647020445.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/41095758513.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/83841746858.pdfIn PDF document text
    • https://domilot.com/uploader/files/27458350433.pdfIn PDF document text
    • http://home-plast.ru/foto/files/45377337672.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/soxedasale.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/56338001094.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zolukuriruludegulifi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/l4rtibjh5ilp34t5crmfrfujl4/judanegiwopij.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/65861935682.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95587308499.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gusax.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f4298a3ebc0fb19061e1e5ab5d3e3e23/43915503271.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_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10968 bytes
SHA-256: c2ae9f534f2358d0ae78a75498e588cdf14465452e63a4172e6fccf4e41053fe
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 19004 bytes
SHA-256: 92476b6f9eefb69b98b92d03120fbc2a4c71b0b821f77317426ba9f0e277566d
font_02_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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