Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7a1ba5520d0b70…

MALICIOUS

PDF

82.9 KB Created: 2021-05-16 19:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fa718d8a03206e270b72f97a7053a348 SHA-1: 712382c7ecbb14a782fc1373486436ee5d670383 SHA-256: bc7a1ba5520d0b7023413eab77391a452261682ebe65d8fd01e996f460c99d1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=descriptive+writing+examples+of+a+person PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494875/normal_60110baa6de25.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/fusugofuxekak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_6005e6a9c47e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5fcf51b354739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_6035cd4565a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_604942e3e2d48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://defoxumaxu.rf.gd/nfl_preseason_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/making_a_wedding_budget_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfe394d-0354-463d-ae04-9e6b0ac8a5a4/43820863454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c7a0b6-d45e-48ac-a362-35cdb28104a2/23002580786.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/immortal_life_of_henrietta_lacks_movie_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a06dbdb-f238-4064-b526-1663ad8780b0/musili.pdfIn PDF document text
    • http://kudawugijamino.rf.gd/fokisonuwitaj.pdfIn PDF document text
    • http://baxolorojujore.rf.gd/budgeted_income_statement_excel_template.pdfIn PDF document text
    • http://fojepik.epizy.com/how_to_clear_omron_bp786n_memory.pdfIn PDF document text
    • http://tavaxovowewut.rf.gd/12189035572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9002b4b3-5dd7-41ec-8929-1c4b48c80950/altered_carbon_season_1_episode_7_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/british_english_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/birthday_image_for_friend.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/getufuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4f3c8b-bb9c-4a54-91ba-9c6bce9fdc28/how_to_open_ms_paint_in_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71855f8c-a038-4e69-933d-f3438df4e26c/meaning_of_communication_skills.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 5344 bytes
SHA-256: 98e813d1e56d144fd6ecfa4059a26932a4f2a32b10aef348a7d1b836d6a92ed5
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 11028 bytes
SHA-256: d1d321b999c8c2ce52e3fcb3d414422ae5ca66ba04d262397a3dba1ff0e5b5f2
font_02_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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