Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2f89d09bbac249…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4a99ec16c331828820c07799bda9a73 SHA-1: 15bbac709891b219d093d9a71495b10b74181006 SHA-256: 7f2f89d09bbac249c493f735e8c44661e6aaa04e6f05adb6ccde018a5e1e1ca6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

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://ubk-sad.de/azubi/userfiles/files/62748484628.pdf In PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/vojuzinuvet.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/woropaxa.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/71613193686.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/letuzusifopijoredili.pdfIn PDF document text
    • https://citronel.com/userfiles/files/23497005826.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/37892192328.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/fedadafulukanegotepaf.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/betedel.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/tajasutevivedovilujinuk.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377fbfd7f31---fisedo.pdfIn PDF document text
    • https://majubesar.net/contents/files/tipugituvaselejuvamu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/55563705150.pdfIn PDF document text
    • https://tavio.ru/files/file/denipuvujonazebesa.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631151264.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/perifozixaxolavuxi.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84453019531.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c40acfac2ba1ccaa497fbe51c9be2eff/kenixapomelu.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/rawuzipevijamaninugex.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/puxamut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hack+someones+snapchat+2021PDF 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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10776 bytes
SHA-256: fade7acbf7c02a22c72666f1f29182e2267495c3a975bb93f121531f58431a39
font_02_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 17896 bytes
SHA-256: d79b5cadee1431e2a8765a93d2358e29cff5031387fedcc7d2728e8b3eedd0c9

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