Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52747ceed19508e…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 22:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d121b3795e922c54c7f532055fff55e SHA-1: 863ba69c7390a4745ad96e94318ca866918abb83 SHA-256: a52747ceed19508e6b88ace33628637c968f19b0c13a3892ae58a4b2a738d489
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous external URIs that likely lead to malicious content or further infection vectors. The heuristic PDF_SEO_LINK_FARM specifically highlights the presence of a mass external PDF link farm, suggesting a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=bible+kjv+pdf+download PDF link annotation
    • https://cdn.sqhk.co/ruwiketi/af4nKig/five_nights_at_freddy_s_game_scratch.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/bikeputix.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/gizixupuk-pepezuwojifuf-wonetasu-tejuga.pdfIn PDF document text
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/fe5291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fc7ae40c8111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_60633f741542a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_60617f9171a19.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hficheF/amazon_kindle_app_for_tablets.pdfIn PDF document text
    • https://ninisajata.weebly.com/uploads/1/3/4/8/134869212/2fbe42f853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_6031015b1d197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_60293fb1cbc7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6013a13042b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_6042d82499a74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5ffa366ef01fb.pdfIn PDF document text
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/8637580.pdfIn PDF document text
    • https://cdn.sqhk.co/daviluzabidi/SjiOiam/ardaas_2_full_movie_hd_1080p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5fec3144367fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_603afdcb12acf.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/ggcijhd/46288443142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_ce374d52c166481a9d0197ec7abb6e38.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_7651431c59fb4c0c9deb7b70509fa8bd.pdf?index=trueIn 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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5244 bytes
SHA-256: 2ac0c33e7f95df22740867096959c72ba8b8549181b0374eb82d814050459746
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 11404 bytes
SHA-256: 3f084fb13e53bbcf37be83ecb0b6b31a8b9962cfa699b778db23e8e769904696