Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f40ec23cd0682fb…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 13:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 842ea36b32caad6e1a77acdf78692f1d SHA-1: d240439a4874647ee48a321101c0cf2bcf77decb SHA-256: 4f40ec23cd0682fb4f84853ed5c3b1758dbf804680067d14b9da8e7ce3a4c90f
184 Risk Score

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
  • 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=asi+hablo+zaratustra+pdf+manga In PDF document text
    • https://pupalajapifev.weebly.com/uploads/1/3/1/4/131454396/103abea7.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/85mieQO/rufipanazezibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447250/normal_5ffccaeeea355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_60374c9a17e8f.pdfIn PDF document text
    • http://gonugotez.22web.org/18603374111.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/zWhghhf/pusedol.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/bc94e5d2.pdfIn PDF document text
    • http://gaydating.world/uc_browser_java_app_jaremzq3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5fc685d63317c.pdfIn PDF document text
    • http://wuduwoguto.22web.org/letter_template_freepik.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/Ihi1ibs/8757118368.pdfIn PDF document text
    • http://wellwork.site/game_of_life_rules_2020lrvik.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ji9Detx/41481965199.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/medial_cuneiform_bone_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jikibepedoroto.epizy.com/denob.pdfIn PDF document text
    • http://kewivawegimomu.epizy.com/happy_birthday_song_kannada_movie.pdfIn PDF document text
    • http://robogotut.epizy.com/59324215490.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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 5636 bytes
SHA-256: a9fb4d7a6d2e7f8ccf18559d87ece0c53e79e0bfe3aa8c20ea53c341dce94706
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11644 bytes
SHA-256: f3c6c8dd5d037ff5319657522f6cd281775abc91360831ba1fe02af0e0358ab6