Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97de795cbe16811…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8fd286e41601b644c1e16adbb1477c39 SHA-1: 0578d25fdd9ca4027a73fe0b044f39a76ce402bb SHA-256: b97de795cbe1681176b1b38298f61187b54db72a6f00590f80601d6bef8bd54d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://frickcontrols.com/uploads/files/zirisivoxozoxifotafu.pdf In PDF document text
    • http://toanlinh.vn/upload/files/37384875994.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://dominant.name/userfiles/file/78447200548.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/42675959931.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffe18986f---tojafovamugujowipaxuba.pdfIn PDF document text
    • http://18554080.com/userfiles/file/44353831818.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/debumofiweta.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/22731766488.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/fesilewozuzu.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/5221700321.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/12474065731.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/97437202015.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/gejuzuxowolabaxikekubub.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210918121424.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekupadonowipiga.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/21395659110.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/dalakusigifibof.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/79947286599.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/97183609416.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/wonitopaxudapu.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/95681048462.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9757947356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=elemental+battlegrounds+codesPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16968 bytes
SHA-256: 0e06f65e29d6f01f7b5a185c7de6fface22c613712319416ebc84bed1bb3aae7
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 10844 bytes
SHA-256: a351d2c04f332b670f567d3025a6efde0ed48f7466a99db521ba7e1f0e8ac417
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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