Malicious PDF — malware analysis report

Static analysis result for SHA-256 04540fd4ec6490f4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 00:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d10ca234bd2f2d19bd7f125a56c06619 SHA-1: d8689c1a59bf45ea028b3c9075d1f7eb7cf9a280 SHA-256: 04540fd4ec6490f4a4484b90cd27a7378831b6692560993815a4f278511823ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://kermoulin.com/userfiles/file/refif.pdf In PDF document text
    • http://roycraft.ca/userfiles/file/giverit.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/77137378436.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/80828148839.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dde7ad124179fff6c48e72a7a5d0e2aa/14370751766.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/3850336360.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8447e627e---26618066953.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/xewurow.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/seseradafebovexo.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/38219169870.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/95773482489.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/31089188991.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/xepabazezerugologawato.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/wizuj.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/20294962687.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/jevuridibetonakud.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nekamovetodisu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/aa8856825bb0153abc04ccc2a991b2b0/65342443692.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/bufatesit.pdfIn PDF document text
    • http://badgerhillfarm.uk/detevoxonugapafipek.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/gigivur.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/88690344967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+download+movie+appPDF 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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 17604 bytes
SHA-256: ff159092208689cac549a4dfef551967bb4b35c67332580f2052f4860824b5e4
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10660 bytes
SHA-256: 69ad9a606697960cf14ed9768adc141b199fb26d23493b0e0f2ef220286f9bc3

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