Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23412fbe560dd72…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 17:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 92703010771227fbba507f74e51277dd SHA-1: 516e49a252271145ba4791959c205fc85c45a9ee SHA-256: d23412fbe560dd72b5cab710aa9d637062f863a3e8c87308b0b606a02acac4f9
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 0.9997

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://maypoin.ru/wix?keyword=ninja+food+processor+bowl PDF link annotation
    • http://fepegabilufe.iblogger.org/70398270863.pdfIn PDF document text
    • http://wotegop.22web.org/69506665202.pdfIn PDF document text
    • http://titofiz.22web.org/elaborate_report_traduccion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_60356fce3aac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_6026c5968d2d4.pdfIn PDF document text
    • http://rorejidefozuroz.iblogger.org/field_manual_capellan_confederation.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/34831035.pdfIn PDF document text
    • http://fujudigisegejeb.iblogger.org/zigulazukeg.pdfIn PDF document text
    • http://xuridikak.22web.org/how_to_build_a_simple_flying_drone.pdfIn PDF document text
    • http://jikalananigopun.iblogger.org/pipejozemunejipijenobibo.pdfIn PDF document text
    • http://fotodosajube.22web.org/tilupizodor.pdfIn PDF document text
    • http://pizixaranifasof.iblogger.org/marcelo_quiroga_santa_cruz_biografia.pdfIn PDF document text
    • http://peraxulamo.22web.org/bafibazoberovijejuwusosuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikikozazilut.rf.gd/microbial_biodegradation_and_bioremediation.pdfIn PDF document text
    • http://punozow.epizy.com/advanced_language_practice_michael_vince_free.pdfIn PDF document text
    • http://vodipofasofuf.rf.gd/cyanogenmod_13_galaxy_s3_i9300.pdfIn PDF document text
    • http://pewuzakij.epizy.com/bayern_munich_formation_2020.pdfIn PDF document text
    • http://sodanone.rf.gd/leyenda_carabali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906e0934-0afb-4a8f-8fd7-c096b086cd43/how_to_write_a_simple_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031d3dbf-24d6-47fb-b459-60ae23a8fa9d/crown_of_midnight_vk.pdfIn PDF document text
    • http://limazajot.rf.gd/arabic_letter_tracing_worksheets.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_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 5424 bytes
SHA-256: d07213d6bdb381aad1a9f14ccf364c26605fc3019c32e58bfa077d451a9779b3
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10584 bytes
SHA-256: 5366a7314919ff0239fd466f7cf16b18346790ea1d89c31fb04deb6c0d7cbf0a