Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7524d665750e4b…

MALICIOUS

PDF

83.5 KB Created: 2021-03-12 02:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bb9be0ea4695c11bf00d1f6d9510679f SHA-1: 5b08e68fcb280164902ec2b3b34d720bf969f185 SHA-256: bb7524d665750e4b6ea994e67fea2a79bc9223cd96ce1c3de7e8351f7748c2ae
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=crash+course+decolonization+and+nationalism+triumphant+transcript PDF link annotation
    • http://geosen.net/mamanupuviginiwudetawiyb79l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/amaravati_kathalu_satyam_sankaramanchi_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374199/normal_5fe257c29544e.pdfIn PDF document text
    • http://leafester.online/principles_of_a_successful_marriagevx1r8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_601ad21461388.pdfIn PDF document text
    • http://kobasobapina.22web.org/wedding_invitation_background_hd_free.pdfIn PDF document text
    • https://wigotimobegevuj.weebly.com/uploads/1/3/4/3/134312632/3466307.pdfIn PDF document text
    • https://jiliwadikejupa.weebly.com/uploads/1/3/1/3/131379685/guwezegositazob.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/4218541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_602dd148ad495.pdfIn PDF document text
    • http://i-men.ru/latin_writing_for_websites1wi80.pdfIn PDF document text
    • http://lnstagramoriginal.com/gatufovirdfyea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a59207-69d7-45fa-8c1c-116568864ebb/95111639226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca854f2-f838-44e2-a068-505280956a59/tedat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d702008-4b79-4ce1-bf74-a4acd762c6df/guns_germs_and_steel_documentary_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f80215-a61a-433e-ab68-594d1e2b06b9/ritiwutelorigefadawip.pdfIn PDF document text
    • http://nezebur.epizy.com/61978771847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a405527f-45cb-4094-b22f-7f0d953e51ae/pipizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0591c00-d4ed-4b57-b46a-0067895ae084/6409780291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47df241b-8a27-45a8-a2ea-a270c22af4ec/sisigag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d530661-b3ea-4cca-a186-06603cbb3876/naweziwuvet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a878d5e-9f5a-493a-bad2-0ed39ea2b41a/kenmore_70_pint_dehumidifier_instructions.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_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 5268 bytes
SHA-256: c150b0ca5e33cc480a9929d9b6931ad7ba4bd6228b26ff00a27ff059d50e5486
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10804 bytes
SHA-256: 0220f770c265bd951f61bd04ad96b116dad05205e66d6e5c5812377eb703625f