Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74b704cf43f185…

MALICIOUS

PDF

71.8 KB Created: 2021-01-20 23:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6fde38b14758fb3227e53c2a4f5ea269 SHA-1: 6717e6eecd5ecc7733a929893ea033edfdc3b760 SHA-256: fb74b704cf43f1852cb7ec5a9618f1fd9f860e607e1ed7b66bcf4fbc27b7c0a3
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=best%20free%20brain%20game%20apps In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5fe33fae53bcb.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/Rz4hbjf/vegas_world_free_slots_on_facebook.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/wibiwadezawuwa.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/5772322.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/aUgjNhj/wezawufemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374545/normal_600470f767b5f.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/kasesa.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/dowanimajo_nosaj_wuvewi_xeniwixurufom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_60037cc13fe5a.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/dewesekewaweke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewumexor.epizy.com/sample_report_for_university_assignment.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/development_lifecycle_and_deployment_designer_resource_guide.pdfIn PDF document text
    • http://nivobilov.epizy.com/jimafirusuforu.pdfIn PDF document text
    • http://pozijirume.rf.gd/top_android_mod_apks.pdfIn PDF document text
    • http://mojofukiw.epizy.com/merumu.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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 5380 bytes
SHA-256: 1f1c2d96395b6d441a77ae1d5d4d4619470609663c1c3757158fd7c3e429ee73
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10948 bytes
SHA-256: 66577c588260698a87e9d49e580dd62981da86242d5373d38cb7af369f397c94

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