Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb7aed5b893baa…

MALICIOUS

PDF

84.1 KB Created: 2021-06-08 19:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 404a1aeab6adf826cb45f4170b1ff6d2 SHA-1: 51159ebefd7b945dbfaea378330965289e38af8c SHA-256: 4feb7aed5b893baaccca47e4b41adffbd407cb92b973b68bcf79d08f3e5e7f6b
126 Risk Score

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 0.9993

Heuristics 5

  • 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 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://nomylo.ru/pbw?utm_term=dragon+ball+x+naruto+manga PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fe7845f2e1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_5fdc53bd7018d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_602fd769b9ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_606153cc26eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_6023f4d2434a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_60276fc064fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_605ba02c331c4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486042/normal_60b4a971bea68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_60be606db69f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_60181bb181732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/f/transitive_and_intransitive_verbs_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d983512-6a2d-4bb7-97bd-0cbbdf95426d/72367455119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5bb66e-e172-4f3e-963f-1b84af18a6f1/dnd_5e_feral_tiefling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4e6bed-d20a-4a67-ad0c-7004ec403384/dazeredukorodixejaveforok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6bf022-053f-49f0-8d3e-0a30791d7cfc/english_grammar_for_grade_3_worksheet.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144579225/zirolinirupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841ce6e3-ecd5-4592-aed7-00871d1865b8/where_she_went_book_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638acef4-8955-477e-a7fe-b8625136562c/how_to_fix_ryobi_pole_saw.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144805341/crack_wpa2_psk_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c4bb92-1fe4-4c6a-b698-ac0175442868/excel_macro_select_last_cell_in_row_with_data.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/axilla_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6790ef3-578a-46dd-9e93-64a4ec49058e/harry_potter_and_the_order_of_the_phoenix_book_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c2eb81-dd2b-4609-be8a-1372a7e6ad92/como_descobrir_a_senha_do_wifi_no_android.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/w/file/fetch/144728214/zudemazubalukaganijiguwas.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_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 5032 bytes
SHA-256: c59ac1ac2f1773db5a5a2ce3472b0ade72b843f48053b78a03f7126ee0133179
font_01_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10728 bytes
SHA-256: f1b3cf3a949deb19c244586171f6143b32a8209b03840cabd2145fd67cbdce26