Malicious PDF — malware analysis report

Static analysis result for SHA-256 4852d034437b0170…

MALICIOUS

PDF

94.7 KB Created: 2021-03-01 06:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7d912926bf9bbe7e9bc9d992b2a4da7f SHA-1: 1807712af28e6a995665b44942070ebe521dec3b SHA-256: 4852d034437b01701cedd90eb4009a723ef7a2a3e9458e5bea45978ac0f82cb6
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 0.9998

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://nipisod.ru/123?utm_term=outlander+book+release+date PDF link annotation
    • http://woberenususasop.iblogger.org/pefimibararerumatijepo.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/what_to_say_about_your_background_in_an_interview.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/short_plot_summary_of_the_maze_runner_book.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/52979879705.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/16815536717.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77781364897.pdfIn PDF document text
    • http://timurberg.ru/52249054179wv5q.pdfIn PDF document text
    • http://robot3.site/ligafagojijavivilonaga2jh6y.pdfIn PDF document text
    • http://tronreserve.online/fulisiwipazefom7p150.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/bexulilevu.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/keurig_k450_2.0_brewing_systemm3kxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5ffdfe9c7a9b0.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/python_add_authorization_header.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davofunup.onlinewebshop.net/vejerisazaw.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/fifulexetofiwujax.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/pikovavivimijegilegosaf.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/formulas_de_volumenes_areas_y_perimetros.pdfIn PDF document text
    • http://zisufabelez.epizy.com/kayn_jg_guide.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 5048 bytes
SHA-256: d83d37a2d8c8aef372861fddbe11c8eb3b4f728f16dcb628a63c090bb94ccc79
font_01_sfnt_off00014922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14922 10804 bytes
SHA-256: f2b8dd51eab6abfd397dc5b0c930fcd90d835e7151ff042885a8178d04dc387d