Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f15af20aba9febf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 05:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60c29096ee9e0b4954538aa2c3551374 SHA-1: e4e873541c692274acb5175e9a206984f7d3a59b SHA-256: 2f15af20aba9febfd650d117f7676fc1bd6071515e18c1d5831eddbef68230be
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by an ML classifier as malicious, and contains numerous embedded URLs that point to a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed to host many links on disposable domains, likely to distribute malicious content or phishing pages. No scripts were extracted from this sample, but the presence of numerous external URIs suggests an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3c7aa2c8d---54317336773.pdf In PDF document text
    • https://cfbadalona.net/ckdata/files/lojulez.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/32969713711.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/gifojinorabemofuvuma.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/tupuposipivifunetubu.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/10657179188.pdfIn PDF document text
    • http://tai-group.com/upload/files/79480795425.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vunuxu.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/25120234021.pdfIn PDF document text
    • http://seritour.com/rsm/files/gibabafugivofofexi.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nemafadowol.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109151954336422.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/nebivuvokiboderu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/88535610408.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/movemumulomiwunexitek.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/nunavorivudenoduguvut.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/16635086014.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bivixotajuzoluzag.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xateleponas.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/62730900677.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/56088147874.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/savilisopeso.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/zevuxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+diam+diam+era+full+movie+onlinePDF 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_off0000b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21C 15048 bytes
SHA-256: 1f6289fbe23ac32e3a13419da2cd9507f37a00d11fc49b24fdc36d19a2bf075f
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10484 bytes
SHA-256: 5db466e8ebc11f4e68b7fee9efc59c43bc21fd02b61c5c049e02e4b861381c63
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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