Malicious PDF — malware analysis report

Static analysis result for SHA-256 05125918847e2806…

MALICIOUS

PDF

83.5 KB Created: 2021-04-06 14:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f6a796789fb89f75eb758b21801b209d SHA-1: d2c5c72bf9e858c8531c9b2d59d60a5b1051346b SHA-256: 05125918847e280617d621c5baabd8b36a84ba98abff36957a0fe6d66fee4b5f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a notable one pointing to 'xajibur.ru', suggesting a redirection to a malicious site. The PDF's structure and embedded links indicate it's part of a link farm designed to host disposable content, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=percy+jackson+what+happens+after+the+sea+of+monsters PDF link annotation
    • http://zedukibawubige.22web.org/belabavezoxibeviv.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/iehcfFR/us_park_police_salary_scale.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/jifjhhf/word_sandwich_solver.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/MKhbhiv/automation_machine_builders_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/Axc5hiW/8618037427.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/ih5R9gj/pocket_thai_reading_learn_the_thai_alphabet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/vesutusaviruxeruzekivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f543ed6e-378c-4856-a6aa-cecadd6cc38e/how_to_reset_bowflex_treadclimber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc38e7e9-4c07-46d4-8fa3-3c3043627363/fimalulapamumite.pdfIn PDF document text
    • http://wokixewo.epizy.com/16078671151.pdfIn PDF document text
    • http://satazajofi.rf.gd/majudawafofixolesuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/46676591168.pdfIn PDF document text
    • http://sixizezovopir.epizy.com/toefl_sample_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffdfc47-c3b5-45fa-98a6-84dc5de266e5/babepalojuwusezoli.pdfIn PDF document text
    • http://jekutekovemimav.rf.gd/31134999008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2c0188-6181-4b0c-9400-765f92c3b645/how_to_find_the_slope_of_an_indifference_curve.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/kannada_movies_2019_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/pevari.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 5560 bytes
SHA-256: 491e1a78ff56327df53fe052e93da1f2ef1430f416c04ab4f2a33f13abdd62bf
font_01_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 11104 bytes
SHA-256: ecaa70feb001ad98a9e888023ca7da8bf2397ca5a9fd783538011cd5e63079a4

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