Malicious PDF — malware analysis report

Static analysis result for SHA-256 e613aa32a1304af2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 13:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c6a65d826b5bf01166d246bffc85f720 SHA-1: 68047fc2f5eb3362ea6f2e6a367715ce15b86637 SHA-256: e613aa32a1304af28a66b9474ffa0ff26c3e93955e39568693c6d507e9adf310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=grand+piece+codes PDF link annotation
    • https://bisnismedsos.com/userfiles/file/mifigoxujiliwofatovimapo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/xasokapevojanirojexep.pdfIn PDF document text
    • https://ibericadearmerias.com/file/wegaxaxidepatobozor.pdfIn PDF document text
    • http://ruihuitax.com/files/file/93112852655.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a45bd06d8---53284789837.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t1p4f6jjd2oe2ri1oleitla905/41770418614.pdfIn PDF document text
    • https://kopari.hu/files/file/17976003988.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/83787044185.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/35203995256.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/64203610241.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/kudanaludumetegulamu.pdfIn PDF document text
    • http://adveotec.com/img/file/28255920387.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/dupugobikuteza.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/rijururozimubilidubu.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10171051677.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/naxivafi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75286591876.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xagituxawodi.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/muxerel.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/45294972906.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/kukumezuluro.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/lovom.pdfIn PDF document text
    • 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 18008 bytes
SHA-256: 4d47aafb68527f6141b7e4b430e200dec05ce017c827a517a844bf26d4999da4
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 10400 bytes
SHA-256: 7e2d802d34e9a9a9020de224929253c57130f4481e75bec7d961ff28ab93f3fe

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