Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfa051b0b49b548…

MALICIOUS

PDF

71.4 KB Created: 2021-03-10 10:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc2f0042a79350e0aa6c5f1e994b093e SHA-1: 74b454a5a4f300e57ec6c349ccd5b7c4466ba8a3 SHA-256: 4dfa051b0b49b54894d269f32da6ad8fb655f2ce4c1da0fcc2e91761f6117375
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to direct users to external sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of external links and the 'link farm' heuristic suggest the document is designed to redirect users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=dental+anatomy+and+physiology+book
    • http://hesap-al-sat.com/149964218644c3ut.pdf
    • http://gnatural.space/gphr_study_guide_david_siler55k9z.pdf
    • http://shoes-storie.club/meluxivogebakektlo6p.pdf
    • https://cdn-cms.f-static.net/uploads/4480173/normal_60383dd57ceb8.pdf
    • http://lovelid.xyz/english_speaking_course_notes_free2v434.pdf
    • https://cdn-cms.f-static.net/uploads/4422879/normal_602b2d057a3d0.pdf
    • https://cdn-cms.f-static.net/uploads/4416316/normal_60344296532c2.pdf
    • https://static.s123-cdn-static.com/uploads/4378171/normal_5ff656e818e09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitajosasa/sowifegilasisezoxif.pdf
    • https://s3.amazonaws.com/ligole/birox.pdf
    • https://uploads.strikinglycdn.com/files/c309f0cc-e513-4fc6-b4de-13a5690ecd97/ganutaxatetesa.pdf
    • https://s3.amazonaws.com/pilazi/how_do_i_know_if_my_motorcycle_alternator_is_bad.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_51c40e3977284f5d8aead0962ff7e5f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c4945ce-1027-424a-a297-0f702cb5682a/fiwafiripidadazi.pdf
    • https://s3.amazonaws.com/ruzumeb/vepobekolu.pdf
    • https://uploads.strikinglycdn.com/files/6e206757-0770-43f8-9a00-ffdfcf6bb229/diana_gabaldon_drums_of_autumn_download.pdf
    • https://s3.amazonaws.com/fedufiporara/35133585130.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_eccb5df1e08c4de6ab857dabec850c02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e7ea723-ae76-4d14-9a3d-7e23900564c6/76494682475.pdf
    • https://s3.amazonaws.com/muvazi/98303840775.pdf
    • https://s3.amazonaws.com/zobuwubedak/atlanto_axial_dislocation.pdf
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_c98c1a86a2df4b58ac9dc38f5b86512f.pdf?index=true
    • https://s3.amazonaws.com/sazomo/barnsley_council_application_form.pdf
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_d6cc3ea3b9e9490bb8019e6b8099be83.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_4f213e3817ab4f6a9646dd0c59239aa4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79d.bin
8a3ccef977f32e6a2ae7ae189ff3ae7098d04ae39b12b33f229bca5f09dfc286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 5580 bytes
font_01_sfnt_off0000ea81.bin
a934fa93383ced34940c9a04ca019297a196e27c49d70ffba33102aa8929ca84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 10936 bytes

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