Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0ec69dd06c791…

MALICIOUS

PDF

85.9 KB Created: 2021-03-19 22:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: eae67fd9d442c41b1049c2de438d93c0 SHA-1: 1af58345a193d6a21604e40849c5a9512084a8d4 SHA-256: 31e0ec69dd06c791dd5c44aa75b96dc182c6bfcbe56cda038579246e7c13adef
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable domains, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of external links indicates a likely attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maypoin.ru/award?keyword=articles+definis+indefinis+partitifs+exercices+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fd07f1d67d1c.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/vonejoxug.pdfIn PDF document text
    • http://sosepojidoduxad.iblogger.org/bluetooth_software_for_windows_8.pdfIn PDF document text
    • http://wiinorama.website/jiwoxoturilskwh6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_600b2ec5b6b7f.pdfIn PDF document text
    • http://wtia.space/lolamawudizp7a9.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/vavomawute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_604df4ea5db5b.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/6384970.pdfIn PDF document text
    • http://nejibaz.22web.org/evangile_de_jacques_apocryphe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_602e22388c8ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fca0d787a57b.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/0e72135667b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fd3cd0153a26.pdfIn PDF document text
    • http://like-store.site/examen_primaria_quinto_grado_segundo_bimestreoygnx.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/tikibumepifofad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_60475fd29570c.pdfIn PDF document text
    • http://lejalabaku.22web.org/67533407885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_b2b654584cb8478e8f77ec7ad3d59a71.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_bf11b65e06ba4663982ad06f6202815b.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_641a37313d9e4047a70450ba1d3e8ad4.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_f4a1e9fa650c45c28fb6bfb6681fa32e.pdf?index=trueIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_f0c8daaf7dcb48b6962881f779af8970.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5204 bytes
SHA-256: a85de21ede28a98e6b2fcf91dc4398dfdb32b6c71623d199489345c33135c087
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 1680 bytes
SHA-256: debaf3ff37cadd88e03f56a1da1b20b0676acbb0c2dfc7de7569b922f44b7b54
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 12380 bytes
SHA-256: 09f3188d4c9a848435786f445a934654ce9df68c152fca894b7d2309122904a5
font_03_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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