Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9c8130e99874c1…

MALICIOUS

PDF

80.6 KB Created: 2021-05-18 05:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca9a40b31d4a542ef5fdcc01e855a4f6 SHA-1: 904f86ef0c476a43d93013c18f00e515925c7972 SHA-256: ec9c8130e99874c10f95bb867240311bd534242aac4d0605fdedceff1af44703
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=how+to+turn+on+bluetooth+on+a+jvc+car+stereo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475987/normal_600c1a324bbb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_603a2a944f70c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_6024cbe470f74.pdfIn PDF document text
    • https://pokumowudo.weebly.com/uploads/1/3/0/7/130740164/xuvitija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ff3440b7d302.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/0b900d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fd7ed256e85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_601a4a87a5bf5.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/6796540.pdfIn PDF document text
    • https://gupibaparokepes.weebly.com/uploads/1/3/4/8/134889539/laxotakefusexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600d334935ddf.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/3597630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_603ed6e5a3f55.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/2d84515d-c3ff-43f4-8a45-2959bf317fb5/dragon_age_origins_respec_mod_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14144edb-052e-4b7c-9ca8-9efc974aa346/autocad_free_download_full_version_2010_with_crack_32_bit.pdfIn PDF document text
    • http://xufesobikaxezo.epizy.com/junevoxanaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db40c7ab-f163-478a-b5f6-f8f130be880d/what_is_a_ticker_symbol_in_the_stock_market.pdfIn PDF document text
    • http://gusepegap.rf.gd/composite_materials_in_aerospace_industry.pdfIn PDF document text
    • http://silapopo.epizy.com/activated_carbon_air_filter.pdfIn PDF document text
    • http://medesoteruf.rf.gd/academy_stars_teacher_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a120ea2-9b9d-4e18-85cf-3d750f3c065f/adobe_premiere_pro_2020_download_google_drive.pdfIn PDF document text
    • http://tebaxisabajix.rf.gd/68500101774.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 2992 bytes
SHA-256: 23460f2a9cb1ed8f1cc56ea1a3e461a6870a380e7dcacbe8ba0157deb356db93
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 5216 bytes
SHA-256: 9e18c7f188ddb136b41c861ef67be55fb0238f406165a682a7c3a569f6116006
font_02_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 10756 bytes
SHA-256: 2e24b9bdce8db12cd145f5c0d4be41f76df191018b4d9eb7a88ca282b2796e6c

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