Malicious PDF — malware analysis report

Static analysis result for SHA-256 447e6a6522953e52…

MALICIOUS

PDF

105.2 KB Created: 2021-03-20 01:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ce2d5490c10cf3c9bfacb42faaa89b72 SHA-1: fd3838bb5eb24560ec3d2c195a95d8c4d7d21b56 SHA-256: 447e6a6522953e52ed3966b014c65126ed75cb0a83aa518ea5c26b6f04731735
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one pointing to 'seumenha.ru' with a 'solidworks+2017++student+version' query parameter, suggesting a lure for software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links, further supporting a phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/123?utm_term=solidworks+2017++student+version PDF link annotation
    • http://matirimekege.22web.org/56844833712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6040ffc897cad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_6003b1f834af4.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/jhiiNgi/43239292266.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ih5ic7h/7495038972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5fdd1aa520099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fede6c76e061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_6023c86245e3b.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/jiahegd/national_education_technology_standards_for_administrators.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_605326c6f2dae.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/Bdgcgek/pixel_car_racer_money_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/hha3gcv/99791446694.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/jjN1CMe/59353996409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safadixuzet.rf.gd/24706581361.pdfIn PDF document text
    • http://xibubew.epizy.com/rupazulepedoba.pdfIn PDF document text
    • http://fosekor.epizy.com/replace_big_jambox_battery.pdfIn PDF document text
    • http://zabuzuko.epizy.com/expression_web_4_css_templates.pdfIn PDF document text
    • http://pozeremadanebe.rf.gd/2014_jeep_grand_cherokee_parts_diagram.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/98684440105.pdfIn PDF document text
    • http://voxinuxo.epizy.com/76260090912.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/44871979464.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 5332 bytes
SHA-256: d34c804d35ae22c40345f52d986f37f0234488cb0e3ee3eb34cfe23630ac92af
font_01_sfnt_off0001418a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418A 1936 bytes
SHA-256: 21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3
font_02_sfnt_off00014acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 22828 bytes
SHA-256: 2f67ad516feb746f92d191f3f584432da03b72f74c8dbddbc2f1d63bd5d3feaf
font_03_sfnt_off00017ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF7 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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