Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87587870faf247c…

MALICIOUS

PDF

73.1 KB Created: 2021-03-03 00:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7e50f7c2179d7d79bb7000b04f39eb57 SHA-1: 3cee9e15ec48ec90fdeda19bf579da32427b3374 SHA-256: a87587870faf247c1e291508c36d4e2197476e01389660b6a1fbdbf73a3f9abf
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://crophysi.ru/award?keyword=what+is+the+main+problem+in+warriors+into+the+wild In PDF document text
    • http://sedouche.xyz/45881153293skq61.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/mojexawi.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/9550965.pdfIn PDF document text
    • http://berkeciftci.net/gegudurunizafunapumixewfub2q.pdfIn PDF document text
    • http://useporte.xyz/papuvasexutozulawarovop1r.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/lefakuwi.pdfIn PDF document text
    • http://spainsale.pro/c_t_o_ka_full_formo5cj1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366647/normal_5fef3b1a31b17.pdfIn PDF document text
    • http://icub.tech/hp_realtek_audio_driver_windows_10_2004ctjfc.pdfIn PDF document text
    • https://fasipibopokele.weebly.com/uploads/1/3/6/0/136096953/wuwerov_ladugolezusug_rowisajadixelup_legufoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizoli/meaning_of_findings_in_report_writing.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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 5444 bytes
SHA-256: 7dd583aac514ddedfb8bbb454bebf71db8cc4d0f7955d0f63bb245359237710f
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10648 bytes
SHA-256: 1f337ed828201dd5c5e36de66a88525f85ad49d3db91e1642698d72ae5d13f1c