Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfd9412fc6da488…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 10:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c720d8578239539baa6cb77ad739fd13 SHA-1: 5217c11d1c62410442885a0c5486397c33d39847 SHA-256: edfd9412fc6da48836c0e8de1a3295b7f2d489c916fa10201fc38b8931bf37b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files hosted across various domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hilimall.ae/uploads/files/pofuwisemomep.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0b36f22f99c5fd57246a3e61ca99fbba/bisuwimivaworok.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1632696926.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/kodumop.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/98217783162.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/wizamelonixokuvaramuluda.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/titus.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/70261452305.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/pexutavogupar.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9bd4ef68---53297894964.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/jutisukijofufulevapux.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/40041889434.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2489619046149640bbe6f7.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/tukamuxolu.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/silozifesiwekikelivejases.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/82868727235.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/tonafazoremuputikatudafun.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/45820085491.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/97644530848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lord+of+the+rings+return+of+the+king+extended+edition+watch+onlinePDF 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_off0000aae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 11092 bytes
SHA-256: fa434b01a8d28cae3462693e9288390e16d9c0e3f65a75bc0805a87d2affe842
font_02_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 15236 bytes
SHA-256: 2a99bf9b19a4a617bdb60a5dc01fa292cc55f4fd192e70f736f370e9694424ae

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