Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa381c7cc5d96f0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 06:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5d6b8e1de3c858f7d59b50e37a8e0fa0 SHA-1: 425959a7af1b455cfb671d6e632934c7c513da96 SHA-256: 9aa381c7cc5d96f02e08e172a7b0ac635bbebf81ecdf52d1437cbc3d6c5c422f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, containing numerous links to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the embedded URLs and link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://deesudcoolingtower.com/userfiles/file/19945873782.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210907160058.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/20364709540.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/mezixomuvazomaxa.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/barelomapevawux.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/98802006695.pdfIn PDF document text
    • http://herve-coiffure.ci/files/18391893546.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/76551965181.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47877817366.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a97f8aef93c715cb0f213f8583f45036/99920025380.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/goxituretagoguwujiro.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/72602258785.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vaxazuno.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/16310655311.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/45305988419.pdfIn PDF document text
    • https://laser123.com/geektic/files/nazebemepugorokoz.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/dozufuzumasen.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ae0a4518---gugivawodesadaruti.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/gofaxozuturasuw.pdfIn PDF document text
    • https://eslms.com/userfiles/file/36135236870.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/nopavizugezunanunijidu.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/lifemozafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wifi+calling+mod+apkPDF 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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 10548 bytes
SHA-256: b7eb43d33ef44c799bcc6487a462d791356001c22115a9b6e9f54de94f328403
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16660 bytes
SHA-256: 85e9ae462cd68261fca1400ed32ddf8a9e42b6400c76f1380d30794a1ee0eb0d
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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