Malicious PDF — malware analysis report

Static analysis result for SHA-256 492bae698ab7bb11…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 12:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb2b1d297e407c8765257c8bb78c87d8 SHA-1: 7d14bf0dd13cd0edcca8a1f1c4c79945e5e442f5 SHA-256: 492bae698ab7bb1152c3766cd5a70feae2ce9eceab4fa3e0cc1b6f36830e7de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a network of disposable domains, likely for malicious SEO or to host further payloads. No scripts were extracted, but the presence of numerous unknown URLs points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://020tzs.com/baige/images/userfiles/file/76617362709.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/bobupilexogejamofu.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42045965251.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/15975629717.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/39910536697.pdfIn PDF document text
    • https://shunnasato.com/ruvofizirepawokawakul.pdfIn PDF document text
    • http://mopron.ru/upload/files/18974090425.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/nedubuno.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210914_015914_118.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/59848315762.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gavimumeparazikabukabo.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/detid.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/40844225295.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/87567681378.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/degokoxitaruwasomapupu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140a522153bc---suwifaxixopital.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nakibafetazewapofete.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/71167862106.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/13060444302.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/towevezatogamezel.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/mikikeb.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109020648083931.pdfIn PDF document text
    • http://iccarrentals.com/files/file/17959953295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jokesphone+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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 10404 bytes
SHA-256: 441d8752a0a5efe56286e9134b125fa01dc03d65a8b16922390c44b4a854c2e3
font_02_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 15180 bytes
SHA-256: b82edc7cf60b51d69cf3f81a83c8284f1d4fd47e5a0b58812c47f86f3c03861a

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