Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b801ccd01a38ad…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 21:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2bf3fd2562e6c70ba80b1e7f2ac8f9df SHA-1: ee0f66f0ff469d3ccac8f775d9ad1a98300d44b2 SHA-256: e6b801ccd01a38ad2e4e4990f85727c9a5b8fb485afb6e796125f5d0de04a07d
126 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title suggesting practice problems, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=incomplete+dominance+practice+problems+worksheet+answers PDF link annotation
    • http://nofubajabuv.medianewsonline.com/manufactura_global_y_gestin_de_la_cadena_de_suministro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_5fda7ec93912c.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/nekagepevino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ff77213dc49d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_603f927c33a23.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/488db.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/rigugapivifexani.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/nomevoku.pdfIn PDF document text
    • http://55571.ru/how_to_get_a_cdl_learners_permit_in_ncuh1fz.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/jejuviw-faval.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_5ff28a519ae5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_60011d6bcbc68.pdfIn PDF document text
    • http://bigowet.xyz/microsoft_windows_server_2012_r2_extended_supportfq2ho.pdfIn PDF document text
    • http://hookup671.site/givexosugagetalago6fera.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/dupowetut.pdfIn PDF document text
    • https://polupamenutotuk.weebly.com/uploads/1/3/5/3/135334754/lofixigof.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
    • http://vuwizovoxix.rf.gd/as_a_man_thinketh_short_summary.pdfIn PDF document text
    • http://vejidot.epizy.com/50693714206.pdfIn PDF document text
    • http://miviguwi.epizy.com/isometric_grid_paper_a4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 5336 bytes
SHA-256: a7c5d89288e711eb039a96c2cdc7cad9590ac9481f6ad69a371905d76aab967a
font_01_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 11020 bytes
SHA-256: c5394017e9c6287c7a36f55af23ed8b53d76cdd4f1f32a6863ed79b584c2b310
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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