Malicious PDF — malware analysis report

Static analysis result for SHA-256 a533fca32bba727f…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 18:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c587e5a29aed3e330f0502d56a9cf5f1 SHA-1: adfe61c8a1a4caaaf29f94f987bdb204e45fa4b6 SHA-256: a533fca32bba727f48696062d78b782ee6e3230ad62e7c401a46253d30815986
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+are+huffy+bikes+made+of In PDF document text
    • http://private-channel.site/zubojawo8be.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/2d49628e.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/tattoo_artist_books_closed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5ff01b0427997.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/how_to_find_area_of_triangle_using_trigonometry.pdfIn PDF document text
    • https://kaxalosenawa.weebly.com/uploads/1/3/4/5/134576513/fajerit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98aa05dee9.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/85786262355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_60127d73c5fb9.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/2462906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jirozeb.epizy.com/69911210667.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/should_i_install_python_to_path.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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5436 bytes
SHA-256: 93dcf677d2fea1bf78c2bd08feef0b4582d20611da532335250f402d46c79c68
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10476 bytes
SHA-256: 195eb30975460e293886daca64d0dd92dac5e6e2d0fd4ff564e76da888f78773