Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6f85842dda7673…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e8f584d5b80c5fd2f5b1ec94244dd22 SHA-1: 3ce8807f08c66df5ede74af253e5ca222394e5a3 SHA-256: 0b6f85842dda7673d9bc0fa82500d9d2b71082e2899ccf4c32b21d6f2c9ab333
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or credential harvesting campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://rsebolivia.org/userfiles/file/32362607045.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/jazuwodesidexetajezaxe.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/melezeneparedorebop.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/94286567071.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/8611653712.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dijunutozowe.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/tunuwositegizu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/ruborigemebegedafowozij.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/20184948653.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/88864643790.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/99443738676.pdfIn PDF document text
    • http://cl-pub.com/files/files/lugavasudegiwowudazud.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/kozoloxopox.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613011deedc37---luruserenukipexureko.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366924b7cf1---rikejapuxiziw.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/nafefesitilelim.pdfIn PDF document text
    • http://enewind.com/pliki/file/73807958476.pdfIn PDF document text
    • https://eguiders.com/uploads/xevofuzibozosapa.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vakixuwawimorepirawaza.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/pizukoxejomabagevojoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=games+like+elder+scrolls+for+androidPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 17000 bytes
SHA-256: 376604e32890791fe1d744f31a3a151f0243f5b73ba6afdc4ba26daa95bf955a
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 10672 bytes
SHA-256: d967305716edff1f203c17941768d149e7646573d727bda4b7eea1885971d4a8

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