Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c8dc7604ebd42b…

MALICIOUS

PDF

60.5 KB Created: 2021-02-12 20:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: fad6e6b681f0d0d4a6f58e632e2c63a4 SHA-1: 5426364a896fc239f1606f0256bc93a3d46c9009 SHA-256: 73c8dc7604ebd42bcb035c418587363c1a7f35dea2d701810c93bd629832d516
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=addition%20mathematics%20worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_601a61e927c3e.pdfIn PDF document text
    • http://itravelgr.com/78371993326fzcxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5ff1d79275f2d.pdfIn PDF document text
    • http://buliwomof.22web.org/credit_mutuel_nord_europe_annual_report_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/E8IxjgN/better_settlers_sim_settlements.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/breaking_in_trailer.pdfIn PDF document text
    • http://pifavobiju.iblogger.org/51847390769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibubifo.rf.gd/28245894288.pdfIn PDF document text
    • http://sejofedavija.epizy.com/xadezagora.pdfIn PDF document text
    • http://zopopujeji.rf.gd/96314724908.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/50961853328.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/camera_scanner_translator_apk.pdfIn PDF document text
    • http://ruzupaxenerod.epizy.com/sap_crystal_reports_server_2011.pdfIn PDF document text
    • http://nivosifif.rf.gd/zimokosopopalesuzenoxaxew.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/performance_exhaust_for_2015_jeep_grand_cherokee.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 5292 bytes
SHA-256: 6a4f432b4bffa23ebbcb5a4d2832ab4df55945b2171d0f4b67b4060fe27bb9e2
font_01_sfnt_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 9256 bytes
SHA-256: ff25b446072d3929ac6ddec80a6880315b054b91becc7c366abe7eb34efa2928