Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f740832732acf4…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 13:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa095e15c86826776572f2916a167ca3 SHA-1: 9119c9c8f48c9dd0abb256d575ec5cca3cf29f49 SHA-256: f5f740832732acf48436298620a484bfd1515e17940d0b370582e6a4e4c971be
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://botokaw.ru/strik?utm_term=holmes+aer1+mini+tower+air+purifier', is identified as a potential malicious entry point. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://botokaw.ru/strik?utm_term=holmes+aer1+mini+tower+air+purifier
    • http://instapriz.website/pakiketakobuxodugoxuraepwxl.pdf
    • https://cdn-cms.f-static.net/uploads/4380881/normal_6055e1d1ddc6a.pdf
    • http://begdas.fun/938088906764benm.pdf
    • https://cdn-cms.f-static.net/uploads/4503309/normal_604f07ac8a239.pdf
    • http://virnet77.ru/dajajusubiwofowaj471t9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_f7a401215dc44ad5a3b79f889dacf9d9.pdf?index=true
    • https://s3.amazonaws.com/gopuze/equivalent_fractions_grade_6_worksheet.pdf
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_4ed31ad235fb41f48e7cf750f6e3cafc.pdf?index=true
    • https://s3.amazonaws.com/feborobegibew/bacteriologia_medica_ana_maria_castro.pdf
    • https://s3.amazonaws.com/dakebesuvum/17525695511.pdf
    • https://s3.amazonaws.com/guwutivupudutu/zesazigekomo.pdf
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_945e156b1e404b5390e1f93a38aed035.pdf?index=true
    • https://uploads.strikinglycdn.com/files/151d7fb7-59be-48cf-9e9c-cae7acb78e8f/46153424006.pdf
    • https://s3.amazonaws.com/kodipopujufipig/grown_ups_imdb_parents_guide.pdf
    • https://s3.amazonaws.com/vojapu/46895906116.pdf
    • https://s3.amazonaws.com/zurovajij/driving_school_2018_apkmonk.pdf
    • https://uploads.strikinglycdn.com/files/fafc9dfe-30f7-4515-b199-af6f0f715dc4/62474888634.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_b065e590652d43cca9401beb67b88591.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/declaracion_de_los_derechos_humanos_1948.pdf
    • https://s3.amazonaws.com/gopuze/58379094968.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_7fa983f8040d42d0abddd7ceffa42bf9.pdf?index=true
    • https://s3.amazonaws.com/zazelujeju/veterinary_technician_courses_uk.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_off0000fbbc.bin
e28ca4fc106a273f98938143013d4ac1790765cee9d901245bc208016569581d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 5152 bytes
font_01_sfnt_off00010d3d.bin
1c16a49f07586e46b86749c4119f56aeaa64dd62c28e4f137b0004dd477e2549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 11756 bytes

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