Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a9de88af9a3c4…

MALICIOUS

PDF

67.5 KB Created: 2021-03-16 08:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36de9c91d77fc41194bde83c2cb5b40e SHA-1: 943df58560fdbe211ef62a353c3bcbd76d71d5fc SHA-256: 424a9de88af9a3c4b4e0d23eccde3131516f472c94018eb7e287e4eae42dcecb
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to other PDFs, suggesting a SEO-based link-building or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=green+cockroach+killer
    • https://cdn.sqhk.co/karopepagu/ChahjlF/38194752134.pdf
    • https://cdn.sqhk.co/tajixixejafi/jgiegct/thoracic_outlet_syndrome_surgery_recovery_time.pdf
    • https://cdn.sqhk.co/xifusajexom/fhdXijv/fuwuzukelevu.pdf
    • https://cdn.sqhk.co/perigupa/Zjagj9p/wolire.pdf
    • http://edaruzal.xyz/mexatajidzjjy4.pdf
    • https://cdn.sqhk.co/zimopaji/frtq0he/rotator_cuff_injury_symptoms_tests.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fe781714d587.pdf
    • https://cdn-cms.f-static.net/uploads/4455876/normal_602c6d9f526c2.pdf
    • http://zujejilolo.scienceontheweb.net/chimie_atomistique_exercices_corrigs.pdf
    • https://cdn.sqhk.co/zafowavo/jilrjgO/vusaporelakifokuni.pdf
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5ff1749790ab1.pdf
    • https://cdn.sqhk.co/defegitip/Dgjiagj/61040784537.pdf
    • https://cdn.sqhk.co/daxozazon/480Phcq/photodetector_book.pdf
    • https://cdn.sqhk.co/tatolodam/hihk2ig/dream_daddy_dads.pdf
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1bc3836884.pdf
    • http://copyright-securityx.com/what_is_the_volume_of_a_plastic_bagm0axg.pdf
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5ff5633c3735c.pdf
    • http://jobware.pro/samsung_scx-4623f_price7kh0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_766312857e294467bd1821bb9dc899ba.pdf?index=true
    • http://nubibubimalepik.atwebpages.com/holographic_technology_seminar_report.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_3b33a51420fc4c48837658e9eeb80f99.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_8d89d074e4dd41a3a96739178fd3a1c7.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_off0000cc67.bin
ff854a691111fbad3cff861cda070287b12ba895745ae741ea52665b2eaf03db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 4804 bytes
font_01_sfnt_off0000dcbd.bin
66737535c169f60920f374f04d57507bd4984f8249158f85e4aee6e537cb9ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 10628 bytes

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