Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e65107832b9958…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f99bf543fe0f369ac7084076288f0350 SHA-1: c894b7189b7b461e4121407be44c3eae32377be2 SHA-256: b4e65107832b9958584352097150aed7f25b562b0c40a38a9257de661002d016
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The `utm_term` parameter in one URL indicates a potential attempt to track user engagement with specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=scert+9th+class+biology+textbook PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2b1bf6be---20473502577.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/13790344006.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/78099380749.pdfIn PDF document text
    • http://juha.be/_files/file/74307459769.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/18827546635.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/15276092466.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/91993401335.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13312918177.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/gurebiwepu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/11268932057.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/sanaxol.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lotiborolal.pdfIn PDF document text
    • https://eguiders.com/uploads/86501249292.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/vinepopiwebesibulidatil.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/99093129988.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nifuwafubumizak.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/vodisifaranoronekada.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_4407E33F2C718352.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/xajirabudijedobatoso.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xalegumitejuwapidor.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidokasix.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908033544432.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96245414478.pdfIn PDF document text
    • 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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 17960 bytes
SHA-256: d451fce3d84a95234a75c9986ceda971d6efa84063ce748c694f874ab3862b0e
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 11096 bytes
SHA-256: f2d2265b42b3010580da523483938bb6c0b2277d6a7f27fd52f8051cafd3c182

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