Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ffbcdf554eabe6…

MALICIOUS

PDF

89.2 KB Created: 2021-03-28 14:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ddb9a7f1dce1e018895e6a7859dda7f5 SHA-1: ed52b9f8e3b9fb23ea79e6428ec9bf4f9e41a251 SHA-256: f1ffbcdf554eabe6b882da648988ad93f6ddc2bd1d7509184630468bb8b31d0c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing lure by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

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://bologen.ru/wix?keyword=crash+course+human+evolution+worksheet+answers PDF link annotation
    • http://prostotit.site/jesus_and_the_disinherited_chapter_49q88c.pdfIn PDF document text
    • http://wabefovelixi.66ghz.com/gracie_s_choice_worksheet_answers.pdfIn PDF document text
    • http://golosa-spasibo.ru/formatos_para_reportes_gerencialesrqbh0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_605123dc756a6.pdfIn PDF document text
    • http://realwockyc.info/it_auditor_salary_big_4c5r6t.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/nilagowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_604683f170679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisedij/11568185820.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/80569422172.pdfIn PDF document text
    • http://godavuvexo.epizy.com/chocolate_covered_strawberries_nutritional_information.pdfIn PDF document text
    • http://wokamanegiwive.rf.gd/a_formal_letter_to_editor.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_6b7250845fe941458719879d726c6155.pdf?index=trueIn PDF document text
    • http://gojudupawoziwex.epizy.com/datosobabapilotokatobu.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_b936beb7ed514f24ae7a8b9b85fae78e.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_75d61ef92ffc491a8419b2aebe9db82d.pdf?index=trueIn PDF document text
    • http://sixijoras.epizy.com/90279082200.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/xugirazujexuz.pdfIn 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_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 5160 bytes
SHA-256: dc69a64e81535af9f4603a211b2e36a03ade2e1d0dbb6196128eaba10f5b77cc
font_01_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 11268 bytes
SHA-256: 3c324bd6b3c0f8f725f43c9f48bc5cd780f9c0d2373571a107560c2589360209

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