Malicious PDF — malware analysis report

Static analysis result for SHA-256 867df99274d223ad…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 01:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d0921320e8f2ba02275e63ec551c0b5 SHA-1: a7bb0e2d6447bfc3c01f41ddf0280f82399ccbff SHA-256: 867df99274d223ad4119344076c611e321e69f1567e994f672dd6cda18945fd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cnsgawefgl.netsociality.com/upload/files/5260422497.pdf In PDF document text
    • http://dade666.com/userfiles/202109file/2021090913054870554.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/80102318634.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/60484608145.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631611289.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/21451980848.pdfIn PDF document text
    • http://linza-market.ru/upload/files/dotimosesexonegufe.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/nizalafebomeligadula.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35f195672---guvawuzelu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/62003328561.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/65485570505.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///46356445766.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bubora.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/87599608074.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/42286499752.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/22501192604.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/86009363767.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd5ba3de2---labarituvuzekarok.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/41477557171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+you+testament+3d+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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 20556 bytes
SHA-256: 651657e1d9c5e2f69ca7f839845fbd723d88c079d1e2d331e40d52ccbed8eaf3
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 10860 bytes
SHA-256: 8019da0cee097cc441611a1883aa2cd71e26d7c7063cb9039b02deed470792c5

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