Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a5ad32547278d…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 20:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2c41bf8f7b13e7ba8e36bd510f54cd19 SHA-1: ee8e1076919a569ab0825d2ec3a0273c0830c57e SHA-256: c85a5ad32547278d34fdf0b1fff74ef362a9768ea756c6e3d0b411a2610a379c
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=yaesu+ft-450d+qst+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_601326a71b83b.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/hejipio/anthill_farms_campbell_ranch_pinot_noir_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/fgdPmyX/gevotujabasewamirozuwigi.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/aee3589dee5a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_6018652ce2157.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/revaxebinilenulune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fe40e4e47a12.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/GgjKjjB/nursery_rhymes_songs_list_with_lyrics.pdfIn PDF document text
    • http://theboldpantsproject.com/naruto_blazing_jp_apkdlmodk9mys.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/egcgfgj/73961194154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416305/normal_5fedc902e3b7f.pdfIn PDF document text
    • http://urolog.xyz/90610484084uwcir.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/bozif_zabitis_kexujezizoba_tokifirep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6021f7e39d8aa.pdfIn PDF document text
    • http://whysmall.space/warframe_ivara_guide_2020z5a5u.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/foiajjh/everform_solid_surface.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hGidgiC/fulisipu.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/gitipelut/28807622394.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_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5496 bytes
SHA-256: f3744662193a6ddd2963d7887a0697bc606f65bef2633e1d281409a5988c4fdd
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 11176 bytes
SHA-256: 3c4b359b12d9b62c833bffb00cad1d9d9a7d277df021bfd562311ba5b4d92741

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