Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55a2f6db9e79796…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 21:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 607566a6e5049f38e2fa55a1ffb7c696 SHA-1: 150e72b916534706c43818d39b5d425a82e74131 SHA-256: b55a2f6db9e797963e712d2ebbf28bc9ef8909cb105be58c0f31e4ed401c6016
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various PDF documents. One of the primary external URIs, 'https://seumenha.ru/award?keyword=dibujarte+book+2+pdf', suggests a potential phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=dibujarte+book+2+pdf PDF link annotation
    • http://barbanapoli.moscow/how_to_get_your_lean_body_massf1fxw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_60336bed17f85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5fec1ed3c88fa.pdfIn PDF document text
    • http://mihetos.xyz/solar_system_worksheets_answer_keyy9h0l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6013f62cbfea9.pdfIn PDF document text
    • http://tibetterrier.ru/whirlpool_cabrio_dryer_latch_replacements9rx9.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/bidemewufa/queen_s_guard_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854aa9d9-44bb-4578-8e59-631ce84f111d/what_exercise_gets_rid_of_belly_fat_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/imagenes_de_buenos_dias_mi_princesa_te_amo.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/bawedaremowubod.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/bosch_800_series_18_inch_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/bulipipetikobine.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/30187960686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6710eb6e-2988-4a42-8212-163a12a25c93/penos.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/febufodo.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/excel_bileik_faiz_forml.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/odia_bhagavata_purana.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_3fcc05964abd4554a96c2411fa796f6b.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_0d0878a4168542c0aeeded2786639ed8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/amazon_synod_instrumentum_laboris_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12fb917-3850-4f55-bc7d-d4d5f24ca2d4/hp_deskjet_2544_check_ink_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13998d76-ee64-4c39-94a5-504d52cc9a82/84944457192.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5236 bytes
SHA-256: ae37f1fcba1e038109f2ff26213740a24ca4eaa9dd7c5793315a7386ad2706a1
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10944 bytes
SHA-256: 6af182f0512c6c86c1f7f2b8410138a63e9c23f9aec2342765625b706d94c06b

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