Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc45ef0b3ef6e835…

MALICIOUS

PDF

86.3 KB Created: 2021-04-01 03:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75920d4ae23cdcacef63bfc38362d7f6 SHA-1: 426cef772c64ba52782fd00ebf22920c7158a289 SHA-256: fc45ef0b3ef6e835ec3d79f04e9adee89b5b9e5144afe48a1419523bb3ba1c42
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to "bruno munari good design pdf" and the authoring application, likely as lures to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=bruno+munari+good+design+pdf PDF link annotation
    • https://cdn.sqhk.co/mifebemige/hvlxuG0/resij.pdfIn PDF document text
    • http://sks-expertiza.ru/d__d_place_restaurantewuhk.pdfIn PDF document text
    • http://probkin34.xyz/how_to_use_samsung_camera_to_translateafs6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604e4ff8a0d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_60387df46399e.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/xiaCijp/mipozixobukaliwejuxo.pdfIn PDF document text
    • http://life-news.tech/how_to_install_acurite_5_in_1_weather_stationol9qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_602d899e97ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_6034773d6e0bd.pdfIn PDF document text
    • http://creditpm.com/57480780856kt34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60271b404787e.pdfIn PDF document text
    • http://uber-global.com/jelowesomigfshu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_604a4b2826e7f.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/YgjtJMG/60605898737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_600223cb504ff.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://setlyb.online/55400287393bar97.pdfIn PDF document text
    • http://woodlesenka.ru/supply_chain_management_jobs_tyler_txm3e5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_328da6fcf2d24db0b6c3ff30ac60d360.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_4ee3306ac534482c9a65236e42613ac4.pdf?index=trueIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_e81565edf42545dab9de499e2a67d140.pdf?index=trueIn 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_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 5380 bytes
SHA-256: 4857c2d63e47dea719da8b1e02ced18a566d02737bb462c343a3bb5e63e212b4
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 14508 bytes
SHA-256: 60f73aa677693ad5c07fec555ee373ecf257cad4a8a23091eca094426bc7feb1

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