Malicious PDF — malware analysis report

Static analysis result for SHA-256 6603da3d82f6b9ed…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01cd9291579f1504360114944fc48e40 SHA-1: c3079d142d577a2bff221a989f51007eb8f41be1 SHA-256: 6603da3d82f6b9ed125ef495fa6189e8d118873625a890fa48b1a980abdc626b
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The embedded URLs, such as https://crophysi.ru/123?utm_term=format+of+authorisation+letter+for+icegate+registration, are designed to redirect users to potentially harmful content. The document's structure suggests it's part of a phishing or scam campaign aiming to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=format+of+authorisation+letter+for+icegate+registration In PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/pagokodojafari-ketuxoxazupaxa.pdfIn PDF document text
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/e2de066b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_605b5f723b5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_606637fa3c356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6034c1cb6d280.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/9f34bc.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/zagajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_6032048882889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_6063ba3a9a475.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/2709024.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/xudewaziparisuraso.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/ropefugazifa_rimuresuso_rabubexu.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://s3.amazonaws.com/tedowafomaru/sanwa_pm3_digital_multimeter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/30051272038.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/ejemplos_de_textos_teatrales_para_nios.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_28069622d8e94a679781f91d6ad46549.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_afdcecbfff9c41269aec6947822485e9.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_161b8a8cc02e445bb3138498ee190ce8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/char_broil_performance_tru_infrared_3_burner_review.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_1d0eb093640544deb8f6f620814031bd.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_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 5132 bytes
SHA-256: 77e8be61b69be93837c4084018d7fd8fafca36988d6e0f7298c41e65404dc8fa
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 10816 bytes
SHA-256: efd0ed1ea46dc375321f437b7b5fb0815d04300f115ddaf38042f54088cf2890
font_02_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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