Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aff14cebfe54a2…

MALICIOUS

PDF

109.2 KB Created: 2021-05-14 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8fbc89764134c34e213a533e5ca074db SHA-1: bd1742e8e12182dd856b8f771a14f62719cd320f SHA-256: 67aff14cebfe54a25c9b586832f9a148efbb59fe3b5974fc07c1010e95ff20e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or SEO manipulation scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://xezojetit.ru/strik?utm_term=william+tyndale+translation PDF link annotation
    • https://cdn.sqhk.co/zejegure/dXxK7he/wukexutetebof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_60100e4647762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_605bb58f45377.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/qKhbign/texas_campgrounds_club.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/hiaDjga/the_butterfly_effect_2_movie_300mb.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/MNjcpih/ramivubajude.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gj6c9rw/75698386892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_606e77f7b04b8.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/hgjgfgd/3127914712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fd11c9472676.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/bjbZ4b1/sivuwusepovenoxazagam.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/AgdAmep/25414889188.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ijcMjao/vipovexamoxogow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigikel.rf.gd/27595442655.pdfIn PDF document text
    • http://gezojetisab.epizy.com/java_windows_8.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_30502a881dac4c8f9004b3a57160211f.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_c286d78c379e450782875fae786c6323.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_a5a40fbf511f428cbb272ce9f336eee7.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_off00016817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16817 5084 bytes
SHA-256: 32d26c5617392c35fd6416a154b205c730adb43148d8f3043b47f48367ad5f94
font_01_sfnt_off0001795e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795E 14496 bytes
SHA-256: b26d1dca884ca8e57fadb2de02589a242f925350335c005281d19d7edeb76232

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