Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4be9bc40d434246…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 05:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dbe3759fcd04467542b55431c3f9f38 SHA-1: b8baed118ee207bf527896cd37990d1eab0ad2dd SHA-256: f4be9bc40d434246d1c96bcf2f62849131da61f89e315c666cc8011652176660
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms or potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also flagged it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to an "activity pdf", aligning with phishing or malware distribution tactics. The presence of external URIs and the high ML score suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=second+conditional+speaking+activity+pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_600e5773da24e.pdf
    • http://helpcenterbusiness.xyz/35989429127rid4b.pdf
    • https://cdn-cms.f-static.net/uploads/4426972/normal_601973b1e07f2.pdf
    • http://xivazokib.medianewsonline.com/pdf_smaller_size_online_free.pdf
    • http://lnstagram-badge-verification.com/allocine_cinema_des_cineastes_parisw4jta.pdf
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/9bf5ad599e2cea7.pdf
    • http://tivuximuliku.mygamesonline.org/avon_products_catalogue.pdf
    • https://static.s123-cdn-static.com/uploads/4425913/normal_5feb289121ec0.pdf
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/rufido.pdf
    • http://yachts-4-sale.com/alcatel_one_touch_pop_c2_hard_reset5od3k.pdf
    • http://lazategomid.scienceontheweb.net/12591144417.pdf
    • http://liketime.fun/xamarin_android_google_maps_examplentjis.pdf
    • https://jofevuwob.weebly.com/uploads/1/3/4/2/134235005/5998558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_85a046923d3d46cc92244e81351e17a2.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_7faa9ef2b73346f28a841e612b4498e9.pdf?index=true
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_58b3e3c5a29647d79ac1b7443f023007.pdf?index=true
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_4df81cb5c9e84c1ab2a4ddefd8f2f736.pdf?index=true
    • http://koduwutuvage.onlinewebshop.net/79279503956.pdf
    • http://sogivuwe.onlinewebshop.net/kobabitenewowigupumajib.pdf
    • http://vulopekusape.atwebpages.com/ielts_academic_writing_samples_band_9.pdf
    • 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_off0000f092.bin
50f9d51cd079fbcb29dce1de9d5695fc528106f463bc74a68d20e01af662aded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5556 bytes
font_01_sfnt_off000103a6.bin
a82b6e0af0b1588e36cd7cabf1cbe21708ddb6cb2686d2f1b6653c3d62e5c97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10880 bytes

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