Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d89f36c6201781…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 04:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59d655373575af6dbec42ebeef9f662 SHA-1: 6b24a46dc444e17bbf8247008b87b30938e164da SHA-256: 47d89f36c6201781102386ed4dbb06d25f574e85f5a1ba11dd8554dffab9439f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=contour+plot+data+in+mathematica
    • http://kobazugipodiv.medianewsonline.com/atlas_map_book_free_download.pdf
    • http://worabipupe.mypressonline.com/dumobekegudide.pdf
    • http://kzrovk.xyz/bindservice_android_studioo24do.pdf
    • http://twirlini.com/how_to_start_selling_resistance_bands15x2v.pdf
    • http://wudazex.sportsontheweb.net/pleomorphic_adenoma_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_564bfbe16acf4560ab479eb99e90fcf7.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_d7848cdf7e4e41c6a4a315bad00efac0.pdf?index=true
    • http://lodonevubepivor.epizy.com/folimajewilimufozozu.pdf
    • http://zenakezogutomu.onlinewebshop.net/68115955494.pdf
    • http://mutupoda.rf.gd/calcitonina_funcion.pdf
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_c5bc7e46a6c04950a76b2b0a6588fcb4.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_b117b4865cd4422c929125e7ec2a8ce7.pdf?index=true
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_c478ac164cda43aa88c9f3b759631cc4.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_4370204614fa4b0a87c5cf279a9654f6.pdf?index=true
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_acbafd468e974344aed79edf6c8cb969.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_a63cc6cd367c4d91b2d6c4b8b4e6ad0c.pdf?index=true
    • http://koxolavomuzo.myartsonline.com/ganongs_review_of_medical_physiology_latest_edition.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_off0000d9d2.bin
269245558fc66d85d4090a2bd3642e9c5d4f54af24ed6213558e83f8ccd3a131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 5040 bytes
font_01_sfnt_off0000eac3.bin
37e07ee7458a81fe67b819dec4a2c96fd39914ded24f891690d87baf5ca73b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 11892 bytes

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