Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa372e4cbe2e3f6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 04:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c8a62376690dd8d5c3cb303e8e82e6e SHA-1: 594fb4232a5ecb16c782c09ba43f14409c7232c1 SHA-256: 4fa372e4cbe2e3f69191976faa61b834f72062e48fd4c15c4b5b891f47580ab2
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to a site that may host further malicious content or attempt to phish for credentials.

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
  • 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://golowaki.ru/strik?utm_term=how+much+do+you+need+to+trade+options+on+robinhood PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5ff8aa6fa42e0.pdfIn PDF document text
    • http://gumoximowukowot.iblogger.org/donewoxopimigusume.pdfIn PDF document text
    • http://hookup750.website/nopitisg2n95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_60220db58652c.pdfIn PDF document text
    • http://useplafond.xyz/zavafimojawo19pjo.pdfIn PDF document text
    • http://myshoes.moscow/nexebiposedirozozeloa2ns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5fe44e58447b1.pdfIn PDF document text
    • http://springwin.space/xonekugomefovaboxdqxxo.pdfIn PDF document text
    • http://lightstart.xyz/dixie_hoedown_sheet_musicnr744.pdfIn PDF document text
    • http://secureappeal.com/dudasexiniotgx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418587/normal_5fe45a47c2914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_602485d3cb910.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/jixetitonubaxojolumimop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_3fcf075c8d9c4fe78460951e5984a47b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/20836633463.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/vonitet.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/guardian_accident_insurance_claim_form.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_2b26ebb4fd4846c6adea21b1c6c6b4b0.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_2843b70fadc049bfa6909fc6b05ab41d.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_caea071795ec45e8b1a52e2f67039b48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/aves_sin_nido_resumen_de_cada_capitulo.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_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 5576 bytes
SHA-256: df3203e839097d037981890d8631ba70b3ecabe84bd440cb5cf75638bb5a4a0b
font_01_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 11444 bytes
SHA-256: 1d9a935727c56aa62852f205ff040fa45e2780a2676be5e02e8146a0ade62a30

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