Malicious PDF — malware analysis report

Static analysis result for SHA-256 033b1bc31f3f42e1…

MALICIOUS

PDF

74.6 KB Created: 2021-06-01 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0ee638d138e83a0228403c4a02eb551b SHA-1: f056082ad0967e6d2aa7740388defe65151599ff SHA-256: 033b1bc31f3f42e1af66cffa4d37e0e415d9e7eb4cecb347876587318e8af81c
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 'irlanc.ru' which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, appears to be a lure related to search queries, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=how+to+stop+auto+clicker+on+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369794/normal_605c66388add6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5ff98a14e5b62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144449544/driving_licence_test_book_rajasthan.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144447984/71235216484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b280b55-ba72-4739-84b4-b9284244efc0/seamless_bible_study_answers_week_6.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/63520162268.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144416775/nenirufovekenibiz.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144419082/nasabijud.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144443565/payung_teduh_full_album_mp3_rar.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144422274/taylormade_m3_driver_tuning_manual.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144432366/vovepimagogusineju.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144427884/el_manual_de_los_jovenes_castores.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144438507/maths_genie_gcse_standard_form_answers.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144414339/descargar_five_nights_in_anime_2_para_android_apk.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144438585/charter.net_email_settings_thunderbird.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/41045904608.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144432405/how_many_characters_are_in_smash_ultimate_without_dlc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa2b522-c32e-4594-b677-5cde65f863d6/que_marca_de_vitaminas_es_la_mejor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548b2f5f-168e-4bcb-a1e9-710ed29e350f/are_government_grants_taxable_singapore.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/75000814716.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438648/wemijeponej.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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 5196 bytes
SHA-256: 2d62f44bd31120a62d121218475f0763556ee3b36eaf6ab9a61aeb78d4517ed6
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 19092 bytes
SHA-256: 6c11e7a3de27043ccf47b54b680a859dbf7883e619d3b432f91f7620d699e5d5

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