Malicious PDF — malware analysis report

Static analysis result for SHA-256 b239efb90cf23f93…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 09:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 24fd3d38ffe128bf95e2b9f688d1c3c0 SHA-1: 149def8f2a35eee50ed11fce4910f6a4c1dd224b SHA-256: b239efb90cf23f93f57097a3ce9fe23a5293bcc10dbb1a97cbb485aab80a6c10
184 Risk Score

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
  • 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://yafferge.ru/wix?keyword=ray+crawford+guitar In PDF document text
    • https://cdn.sqhk.co/zopimoforaja/jcjdDR3/65132055782.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/affairs_cloud_current_affairs_june.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_602c82ff3a788.pdfIn PDF document text
    • http://gafujovinotu.22web.org/powufamerozajonugupubu.pdfIn PDF document text
    • http://rusedewafizurap.66ghz.com/13550085655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fc6a849260c6.pdfIn PDF document text
    • http://lupelev.22web.org/dimplex_electric_baseboard_heater_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602cb468738f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fcae0dd86e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_60221ec48723c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_600083663f7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6015301976f7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumirukilifu.rf.gd/apex_legends_crypto_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/all_eyez_on_me_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/oscar_wilde_biography_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/77217997975.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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 5180 bytes
SHA-256: 7f19a59fda01039e329647769220c8406278c7730e022509aced5d3ca83c4e83
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 10472 bytes
SHA-256: 23391c2a51be47466758392812ffa4c87ebcb9852645e1b36df2db7343bd4557