Malicious PDF — malware analysis report

Static analysis result for SHA-256 4739c3ca550371e1…

MALICIOUS

PDF

86.6 KB Created: 2021-05-25 09:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4cca4de59a85f6e1f042c150e7cf150b SHA-1: 30c070460bb522a719a72050e906391bb22f5eb6 SHA-256: 4739c3ca550371e1e01439d66ffeaff685fffdca40b6a9a8592daa42a1864fcd
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://resalured.ru/strik?utm_term=reposicion+de+certificado+de+bachillerato+unam', is likely part of this phishing lure.

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://resalured.ru/strik?utm_term=reposicion+de+certificado+de+bachillerato+unam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448727/normal_6056ba3c81b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_601611aae00ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5ff222889ab21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fce8bde1141b.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/zenilagujaw_jonodura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_5fe9d8e0ec704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_6004cd07194bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5ff8cda1b040d.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/1a9e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/feliso/42271870432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4869d50-9425-445a-9c66-1272c2dd5f5b/wodejemobobel.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/97839572929.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/85395870027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e76904b-de9e-45d5-8cd4-faa3078296c7/dlink_ac3200_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/papilas_caliciformes_inflamadas.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/application_form_for_korean_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/new_shooting_games_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3937b6-b0d8-4e81-9dda-1df7dd1ee255/forgotten_realms_novels_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/80580632241.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 5424 bytes
SHA-256: 730775a2a5c2e75547c01c9b9c79d731b09d6d4081829f8cf2d03dc07fd07e70
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 11988 bytes
SHA-256: 7f11ba64bd19f0ca2fc19b3abc6d910a2fa01bbe0c82a1e14d7e1bf153dad81f
font_02_sfnt_off00013d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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