Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97218c1cb2a1c3c…

MALICIOUS

PDF

95.5 KB Created: 2021-03-16 08:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d526cc1dd4b8a773daf3eadfb486369 SHA-1: 084838dcd1ded83951ebdf6bc5a57a3d5537a70f SHA-256: e97218c1cb2a1c3c02e5ecd857ac2c5526864a6f8d1ff154430767fa423e0316
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier returned a high probability of maliciousness. The document contains numerous embedded URLs, including one pointing to 'xajibur.ru', which is likely part of a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=berliner+platz+1+neu+intensivtrainer+pdf+download PDF link annotation
    • http://kokoponabile.iblogger.org/91202948939.pdfIn PDF document text
    • http://fujalizipuderi.22web.org/99257597019.pdfIn PDF document text
    • http://gunaborekigefu.22web.org/dictionary_for_brute_force_attack.pdfIn PDF document text
    • http://xizunamorazoved.iblogger.org/what_is_the_difference_between_meta_analysis_and_meta_synthesis.pdfIn PDF document text
    • http://gonugotez.22web.org/background_scenery_images_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://ninamivekadod.epizy.com/what_is_the_history_of_medieval_period.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_bb2fed01546f4a89a5eb1df7825f43d5.pdf?index=trueIn PDF document text
    • http://nekodigeteremi.rf.gd/sheet_street_vacancies_in_cape_town.pdfIn PDF document text
    • http://mepoketefetur.rf.gd/73621107823.pdfIn PDF document text
    • http://jitikatul.rf.gd/lisujedoli.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/90741220178.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_9710d2cb31e5464b8110ef46b6202324.pdf?index=trueIn PDF document text
    • http://tukejome.epizy.com/towelerogofamilarigif.pdfIn PDF document text
    • http://vevojadiren.epizy.com/hays_australia_timesheet.pdfIn PDF document text
    • http://xozesaf.rf.gd/the_best_science_fiction_books_2018.pdfIn PDF document text
    • http://gefegeku.epizy.com/tomofoleporeso.pdfIn PDF document text
    • http://buximonerivib.epizy.com/example_debugging_programs_in_c_with_answers.pdfIn PDF document text
    • http://xizesewidepo.epizy.com/rizamukopajoboguwanabi.pdfIn PDF document text
    • http://rugadugekowe.epizy.com/zomobagosiranazuru.pdfIn PDF document text
    • http://wovotunuvovon.epizy.com/wirezanaliz.pdfIn PDF document text
    • http://gozipoxux.rf.gd/python_interview_questions_for_data_scientist.pdfIn PDF document text
    • http://jezesukawug.rf.gd/67721654511.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 5336 bytes
SHA-256: fd82a18b4313e24e560216441b0ab45494f0e597aada2841159427168f503360
font_01_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 7444 bytes
SHA-256: bc2be444a3d457fc905816752819178bca9bcf65c30da6f5648973b331f9db7d
font_02_sfnt_off000147cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CD 12632 bytes
SHA-256: 4ab62185583e55c698ae810c7c001d6ab96a61ac30117018b1b4823498f56d44