Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f5f3cb1cafc6d2…

MALICIOUS

PDF

72.3 KB Created: 2021-03-28 11:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 17baee2ac3487b2b8c0f080e39429240 SHA-1: df30ea9ca838811a049c7766a8eba52f49bd8a43 SHA-256: 25f5f3cb1cafc6d28a27566373c47b0f68d17153ba82bdd7f2eee58eff553471
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru/award'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=english+synonyms+and+antonyms+book+pdf PDF link annotation
    • http://vowujebotoza.mywebcommunity.org/seated_core_exercises_for_seniors.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/2652747176.pdfIn PDF document text
    • http://vofufime.mypressonline.com/how_to_draw_a_constellation.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/53768915107.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/switching_and_finite_automata_theory_book.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/zygomatic_implants.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/46223512619.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/ielts_academic_vocabulary_list_of_words.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumalidik.atwebpages.com/sda_church_manual_2020_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/januxid.pdfIn PDF document text
    • http://lenofafezanobu.atwebpages.com/hydraulic_bearing_puller_project_report.pdfIn PDF document text
    • http://jegegapi.rf.gd/cqc_dental_inspection_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/fibot.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/mathematics_teacher_s_guide_grade_11.pdfIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_2c29eed019e64465bf8122254f1eb9d1.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_cb3306aa0bc943948240ee1dc416c1ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/57216626103.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_11b079a226de4128a1e13ca702f418d5.pdf?index=trueIn PDF document text
    • http://nazifaba.rf.gd/52926506410.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/91740009459.pdfIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_855751a5e92042e49f1f13defaf53ae6.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/carotid_sinus_massage.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/2013_honda_civic_service_code_a13.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/24164465785.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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 5624 bytes
SHA-256: 5acf216f6c1394db49d73e16d9bd1080d0d76e48ed66786da97ce56be70e5956
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10700 bytes
SHA-256: b1fe823c73fb5151946a64366b80bd8905b66717cae0bf7350d09bd7279c287f

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