Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec149911d63fad55…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 04:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c00e4e237cc68d8157349009edc6b5a7 SHA-1: b856e5e527726249285818ec459336390b156493 SHA-256: ec149911d63fad558391bd0f53541ffc56153994d72e58bb932a44c5fbfceaac
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains and link farms, suggesting an attempt to manipulate search engine results or distribute further malware. The document body, though heavily obfuscated, contains references to 'economics chapter 1 section 2 assessment answers', indicating a potential 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://fokemale.ru/wix?keyword=economics+chapter+1+section+2+assessment+answers
    • https://cdn.sqhk.co/letaziseb/wxghhh3/2221001487.pdf
    • https://cdn-cms.f-static.net/uploads/4374983/normal_601d69b1c4bdf.pdf
    • http://tuzevijubozor.mywebcommunity.org/alimentos_recomendados_para_diabeticos_tipo_2.pdf
    • http://fudoviwil.mywebcommunity.org/how_to_start_a_craftsman_2800_psi_pressure_washer.pdf
    • http://spencermcman.us/pivifubegoruzomenarazipeec4ax.pdf
    • http://wupidubame.mywebcommunity.org/55582685526.pdf
    • https://cdn.sqhk.co/xekejegixawo/ijfkDuV/dual_monitor_wall_mount_bracket.pdf
    • http://fulokixowo.scienceontheweb.net/21721980204.pdf
    • https://cdn-cms.f-static.net/uploads/4380393/normal_6019374d5595e.pdf
    • http://widonatozeg.mypressonline.com/10688622351.pdf
    • http://zuvels.xyz/runolenugeg47o8z.pdf
    • https://cdn.sqhk.co/kesavaki/jg3gdib/gudovobalozibun.pdf
    • http://xevijuwidenuxet.mypressonline.com/allaitement_maternel_exclusif_dans_le_monde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_7d36f960d777442bb6b0ed583b4d1884.pdf?index=true
    • http://rixigor.onlinewebshop.net/87862506693.pdf
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_55417558e38348f0ae662552ad0b8ed1.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_eb20300cda934ad58dac290958f8fb4c.pdf?index=true
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_1415ee2ec5a542a5961c4f2e62b17846.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfa.bin
7d1812bea8ddf1119eba0d48fff013fd31a42ba4a539faaccead92d57c87cb0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5376 bytes
font_01_sfnt_off0000ff2e.bin
1586d4d9a81d0e870c6991835a83a33763c5ebccb9df7085d93404b055b0a179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 11136 bytes

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