Malicious PDF — malware analysis report

Static analysis result for SHA-256 612e5d9b89bd8530…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 03:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e788840b2734ed1295b7c1ad1a2d411 SHA-1: e903bcc52746529be705b09ece8d080b55047379 SHA-256: 612e5d9b89bd85302f2c37b115dab6127869573713f41eea122b49a734e4ea59
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute traffic across many sites. While no scripts were directly extracted, the structure and URL distribution are indicative of a phishing or spam distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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://topinsolventa.ro/userfiles/file/76848940758.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/57826324576.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/xolevolekolalagigenoj.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/jugirazisof.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/mirox.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/68000209678.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/27723151022.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/mozeleto.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/93527769165.pdfIn PDF document text
    • https://airbays.com/userfiles/file/69903412488.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5cfc0169---vowagejoganadukowevus.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/kezesetegegizij.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7g9sv2r5hii7upftbs841pomba/vumomojigagogup.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/gukesidek.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/7956443614.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/76061251721.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/juwuwufupopozakuragef.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/fapanomulejunuwojoz.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/dedotinasil.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fe8757c17---vorotujatereb.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/timoxago.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/jataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=guru+puran+in+gujarati+pdf+free+downloadPDF 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_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 10860 bytes
SHA-256: 0301712a8ff2da94ff86f70664da5f590fd3fef26ff9f59c97c589bd6d477d8c
font_01_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 19536 bytes
SHA-256: 85016d4958102fa99ac0a182b255af4cc7dbb912a7619a6dfa259a4a492fa870
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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