Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94dd45657413985…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 10:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7b684290e49c7403783a8db8020b2a09 SHA-1: 41169beb0ce676430f537bb70f65213cb73c1705 SHA-256: d94dd456574139851269be4dac77cf92986884b516b4df089c7d5dae65e2c8b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=ambulance+man+badge+notes+pdf PDF link annotation
    • http://normal-id.com/what_does_it_mean_when_your_modem_is_blinking_orangeztcj6.pdfIn PDF document text
    • http://shoppingyxplus.xyz/accounts_payable_aging_report_quickbooksbm9vz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_603eb1ccb9431.pdfIn PDF document text
    • http://xodulik.66ghz.com/libro_bhagavad_gita_en_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464709/normal_5fef5e4186a6c.pdfIn PDF document text
    • http://kvyovk.xyz/parenting_from_the_inside_out_by_dan_siegeloj3mr.pdfIn PDF document text
    • http://reawolt.online/kapiziwabinezaserusiraw3uj4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fcacdb9922d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_6008f984abd02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_60026e22ade8d.pdfIn PDF document text
    • http://peroruse.iblogger.org/bozijibidivuvesumota.pdfIn PDF document text
    • http://erethiztzj.space/714275594177wiix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_6056f5b9077d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_600ad97a2795a.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/dae32118-1e6f-4218-b451-c51ea38a54b1/wuraleligobosawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edb7806-779c-48e0-8bd1-b505082537b1/gozibilomego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82e76a6-bd74-4f43-ba32-f3fbdfcb1a4b/noco_genius_g750_not_working.pdfIn PDF document text
    • http://vepilezora.epizy.com/agile_project_management_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3d4848-215b-4cf6-9fee-4c2cb1278e31/microsoft_sql_server_2012_free_download_64_bit.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_7b77b21bcdfd489bb34ee46452eea2d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b290d5a8-775a-4229-97a2-52bd1311a1c8/kifimiwanobej.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_0ec08ec32a834e1c90ce27cf0f96a8b5.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_c951d56a547045e392d213bbf3b13ebe.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_96c2c2027be44250bc14b5b4465ee7f3.pdf?index=trueIn PDF document text
    • http://lomonejezatixow.rf.gd/basic_shapes_worksheet.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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5508 bytes
SHA-256: 31015beb93467fdb6a4f57de816c4db6a43dbd093df00330e02fac479179ea33
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 11068 bytes
SHA-256: 1a6b2fed31abb404f511c297d5ffb3777b47e15439a975a49d939cd2399fb914