Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d10598276e48ab…

MALICIOUS

PDF

96.8 KB Created: 2021-09-10 21:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4ed465df8e029a5dac89510002fcef7 SHA-1: f71b316bc51423f5738ef60012fd2f9f5f59a8ab SHA-256: 34d10598276e48ab3d285c9899781b210027e3a3bae9f279d434bc419fad2de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://telewebmarketing.com/FCKeditor/file/fuxito.pdf In PDF document text
    • https://dodatnojamstvo.com/userfiles/file/74558603043.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15300601700.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/gezojugukoruset.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/25770701409.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/tubukegel.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lipagekepenowa.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/44942588471.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/84308126435.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarimowumunalox.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/42739462795.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7maovnflt0k53lq26l012rd104/molejuwosukizebuva.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/79212189457.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/senekemazedofalatow.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jolobufuzofob.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/36172650453.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zajutavuzamefo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613978154a167---lujovutamejumapo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903225259.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/mipolonixofevuzuzeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+check+following+on+instagram+private+accountPDF 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_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 19084 bytes
SHA-256: 3c57a3f95be8c698902e61ae7068d3714f3d67d0de7841753f70fc964cd9f8d1
font_01_sfnt_off00014324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 11264 bytes
SHA-256: 8d93dac609d1720377b7d9b9e7caec0c148d4e66d5f9309555c41a9cd3bd20db

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