Malicious PDF — malware analysis report

Static analysis result for SHA-256 e567f5d4ed97a672…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 19:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4981214855055af6e8d4570033cdf540 SHA-1: bdc06c13b71ad9159adfd72736d24b8838e2dd2c SHA-256: e567f5d4ed97a6720d6db03ff663a03210bff542447068e1efb2e7a2114fbee3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent, likely to distribute further malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://whereestar.com/marinarubicon/admin/file/vunedejelolujipola.pdf In PDF document text
    • http://behtarinekhodetbash.com/files/files/neduxefavufevubuzo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/79328408277.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108311731002944.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/40598079774.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/63650719272.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/bodakezudonukisesodot.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/50007156540.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/79552887974.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137df7e04682---11610043205.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bosakeniludivowowa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101834329602.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69931055441.pdfIn PDF document text
    • http://gapp.fr/medias/files/zosuvuwixakevatajun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=about+ray+full+moviePDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 18756 bytes
SHA-256: 0ba9d240ab1d810393934a5bc77d423c8cedc40117366b1b9db7cfc72359cd2c
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 10504 bytes
SHA-256: a914c048142adcfae53bd100347f335b99e3194c3d1667a9b686365d96cc5b1d

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