Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7df86f9f464a39b…

MALICIOUS

PDF

74.0 KB Created: 2021-06-05 06:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87df6496a9327ed2089a8490b4fd5b3d SHA-1: 53f86f5af3e8ce0b866ea3d9454c6b832ae9f68b SHA-256: b7df86f9f464a39b61c0eb0e1433f1f280b582d2666b5d1f369b62fb19b4f55d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an external URI pointing to 'chcial.ru', which is likely part of a phishing campaign. The PDF's structure and embedded content suggest it's designed to trick users into clicking the link, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=corded+phone+with+answering+machine+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445341/normal_6019babd1cb51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_601bab9481e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fcbf12ab63c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_603520154dc15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600db65f004d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_5fffd687cfd1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_602ef10f806b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fdeef0338a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_606a2d53efc09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fd7d0a1274f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff3a9a8e7eda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5fdd4785205cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_600a4f24f0f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6045fa003660c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_6010a3be5133f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fddbcca0d668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8eda9d-4ce5-4733-b7ce-5006a603a4e6/29898013715.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/zusolikixeluru.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144517896/manile.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/f/al_qaeda_al_noorania_download.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144642474/dupipibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2af39c-786e-4ae6-b2f8-2476794369bc/what_is_the_chinese_sentence_structure.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144492207/epithelial_tissue_histology_pogil_quizlet.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5484 bytes
SHA-256: c262e6cfe2036ca0c092cd633694552f392f32b57162b44a239553fcea26011d
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10820 bytes
SHA-256: b50d71cd22fa5a83f7109471f434b17665e8837d5d23aab0e491f40c8601a40e

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