Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d459e48eb3c2f2…

MALICIOUS

PDF

99.6 KB Created: 2021-03-24 22:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4876b6ce37e332384fa3687d502b7f01 SHA-1: 947b70368d42421dc41299b6ee948f4d1200c083 SHA-256: e5d459e48eb3c2f2ad2d9e992108c869560f2bcded0687682f9f18d31f4dbd3e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The embedded URLs and the document's structure suggest it's part of a phishing campaign, likely using a job application lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/award?keyword=c.+v+sample+for+job+pdf PDF link annotation
    • http://xiwogukonefem.iblogger.org/construction_line_logo_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gjjhNic/befib.pdfIn PDF document text
    • http://tivewuba.iblogger.org/spanish_books_for_beginners.pdfIn PDF document text
    • http://affilateapp.online/fiwuwupojagodedegunigmc66.pdfIn PDF document text
    • http://avtoshkola-region26.ru/que_es_tejido_conjuntivonowy0.pdfIn PDF document text
    • http://goproonly.com/the_empowered_empathk5pmu.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/aiggcge/pasukaxonufop.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ujidjhF/16281304614.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/jgiaiig/16823901656.pdfIn PDF document text
    • http://betmoy57.com/xitoxalerajfvjrr.pdfIn PDF document text
    • http://ludshop.xyz/compaq_presario_cq57_drivers_for_windows_7_32_bit0otat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_ccd099bd2dd74066ad275f08dc3edc7c.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_a27af984343c4096b78c62a05afe6fd5.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_7c98109fa18f49719073441e37c787aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/kutodubazekeb.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_ff876a0559c748b29a1e62e42d15cc6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/breakfast_sausage_nutrition_information.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_5219a4e8923a406ab34c166e6892f699.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ffe261720a6d43798c3093a3db5e6eb2.pdf?index=trueIn PDF document text
    • http://ripazek.epizy.com/comparing_quantities_class_8_worksheet.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_294d0619215c462c815d2960c16230c5.pdf?index=trueIn PDF document text
    • http://rokumezex.epizy.com/presentation_outline_example.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_5c4dce3d8f314c149ead0fc31a16cf30.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 5072 bytes
SHA-256: 23f1e72976775458402f3d5ff29c80da693b3bbf077c26d2ef7ab954a811589e
font_01_sfnt_off00014c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C65 11204 bytes
SHA-256: f93ac5a334a7a39c24ba4e7b16459c4aeba2bd910c10389b3074acabcc48d6af
font_02_sfnt_off00017276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17276 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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