Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad9a441a6a05106…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 21:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1f0b3ba41902d9d0be77c263816121d SHA-1: 4e2fccb4ee1aa3956b4da840d2c1347ceee6c8a5 SHA-256: 4ad9a441a6a051069c3806e9840b2d8296e204e4ec053131dbb529128ac72057
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high concentration of links on potentially disposable domains, suggesting a tactic to obscure malicious intent or distribute content widely. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://oppedisanorobertosrl.com/userfiles/files/tulezi.pdf In PDF document text
    • http://chronocertif.com/userfiles/file/sivojokan.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xikojete.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ragopemevotasukokalerazu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/36133167821.pdfIn PDF document text
    • https://solturism.ro/images/file/dupunonubozi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rexozipofewabepijadalava.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/buvasokesuwomizogarom.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pazimije.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/11699961190.pdfIn PDF document text
    • https://almavilag.hu/files/files/jimimidokelaful.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5d6bd626---22221718196.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48748922003.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/suxuzezukopir.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/kolar.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jalakezutadusufinebabef.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/52688174801.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/25720371044.pdfIn PDF document text
    • http://cncsprings.com/d/files/30220317034.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/54119422788.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gipukizajorejavuxemima.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120744597421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clear+cache+chrome+android+phonePDF 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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 17852 bytes
SHA-256: e4efc354d714f7d1ba5f23d06ab794ac072c20cb9671f6bb3b05d576d56acf5f
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 10544 bytes
SHA-256: 11378ab98ca36606d221180ae18f802b55cad7e907cc8f3815f71b01d9ee1451
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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