Malicious PDF — malware analysis report

Static analysis result for SHA-256 033b37e609fd236a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 13:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d7ac934ff05ef9d876887207b16ef517 SHA-1: a2e04b019a92bbee553459217e2cb809e996a5b1 SHA-256: 033b37e609fd236a18e1b17e6c96ddf917dcd56f9de84c82ac88fff93b03d978
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to search terms, directing users to a suspicious domain. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=lug+ripper+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff9b0abd07fd.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/cg_police_2020_syllabus.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/standard_model_of_particle_physics_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600c76f3f1ed9.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/nudarinokodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5fda9438e4ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_6010b3de9de60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5ff55b0f42da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fd7d08490cf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_95e6f9922be543ba875aed2165898c96.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_912dd5f4ad934580936b79537dcdf8fc.pdf?index=trueIn PDF document text
    • http://zaduzos.myartsonline.com/66726772924.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_are_cultural_values.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/libro_nueva_evidencia_que_demanda_un_veredicto_descargar_gratis.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_1cdcec791d7347989a96b8fbda186e4c.pdf?index=trueIn PDF document text
    • http://domuromu.atwebpages.com/josatozezeb.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_0c9893a140ce451b86e89e18c3dcfcd2.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_c253f2d644b449faaff5ac13a46d410e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 4868 bytes
SHA-256: 7daf36963868c41b95ceaf6b083e3a38c7f268f08a93673016f3e35d72afe46f
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11672 bytes
SHA-256: e8a0e0bd4f1d1012d1c24b3f9940cc1585256c3bf096c0636769c864597e6bf5

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