Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1e3832fb380892…

MALICIOUS

PDF

86.3 KB Created: 2021-03-27 12:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a6f680bf44780c7058b891b25b0c977 SHA-1: 0e6d1b23f52dc25ea9bfd88facf90ebaff791f50 SHA-256: 4f1e3832fb38089248febf04af8ec07060f41d95614e2c57edad2d0d7215c296
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, masquerading as a hospital retainership letter template. It also contains multiple embedded URLs, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/123?utm_term=hospital+retainership+letter+template PDF link annotation
    • http://tebapewulodafe.getenjoyment.net/how_to_do_exponents_on_texas_instrument_calculator_ti-30x_iis.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_reset_xfinity_remote_xr2.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/69361825167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5fd876b908e66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_5ff4f5a94fd7e.pdfIn PDF document text
    • http://zinobesejumafix.iblogger.org/21101900543.pdfIn PDF document text
    • http://vkysnaya-eda.site/dirozemanikijirigodyv6xl.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/stay_hungry_stay_foolish_by_rashmi_bansal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_6007ac5a64b51.pdfIn PDF document text
    • http://esmoney.site/dogafuvipopun01l43.pdfIn PDF document text
    • http://ilook.market/how_to_fix_error_code_6000_canon_printerbwj33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momewitu.epizy.com/vivisutu.pdfIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_d2deb900d8d842f6b83261805b81350f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e16a758-1b35-4495-9626-5376f1dc77be/how_to_build_muscle_after_40_male.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_3c1d1dd318514b00ad1e9a9d99006226.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_423f2665a40b467797d12b71b64cc30f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d364454d-d43c-430d-9ff7-fd299dff5bc2/lg_bluetooth_headphones_for_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9053cbf2-3d8a-41a3-b0c1-888482b4ecf8/sas_ods_excel_title_style.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_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 5020 bytes
SHA-256: 8141d51b08538635928ad1d3ab0ca51941bd261130a51750c9b7661afdfac449
font_01_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 11040 bytes
SHA-256: 4e14f4250814f81b5f1ab2111e5d195239be55b6e2d0e9229d7267eb78495a7c

Open this report in the interactive analyzer, or submit your own file for analysis.