Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a4b8bcdf9c9a44…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 22:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99fe05e6b19918e1f16d4de5f055178f SHA-1: 6c5eee560e2508b4f000aa6a8cb20bace7566313 SHA-256: 38a4b8bcdf9c9a44c6cb9012cd390fb3f037afe0ee0075eca400d1edbae95b82
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, with one prominent URL pointing to 'dugedepap.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent.

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://dugedepap.ru/award?keyword=common+idioms+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ffeb61d3a6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_603202c00f051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd30d10a7baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_600bf5b87b8f9.pdfIn PDF document text
    • http://neyroskakalka.site/gopuxelurowox7uoqt.pdfIn PDF document text
    • http://leree6.club/8355560039gm68l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6033825102fd8.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/43942084302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_603dc577eb35f.pdfIn PDF document text
    • http://arendaavto.taxi/8768662744024tbe.pdfIn PDF document text
    • http://mjawebdesign.net/beyonce_platinum_edition_download_zipoesuq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0421fc7-fd5d-4e1b-9a34-1175d83491ea/the_one_year_chronological_bible_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/impossible_quiz_question_36_answer.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/drawing_right_side_brain_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319bda40-2ac0-44f4-8af4-88f05f49f0b0/43388189601.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/my_old_toshiba_tv_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8988c1c8-830e-45de-b144-4af172a06962/speed_queen_dryer_installation_instructions.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5100 bytes
SHA-256: 81cfbb67ac5ae8c73c788104f447a4c57aae50acf95aabfaa31c91faf08e6757
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10960 bytes
SHA-256: 09146a494dea6d115f651f393c6294edbf2795fffd935a91313d65ce8b8999d1

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