Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a937e8a047fcc7…

MALICIOUS

PDF

76.1 KB Created: 2021-06-15 10:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a361b3fa63b55f1ad0dc6602dddd16c SHA-1: aabb805b4cd7ebc72d2a84f4923010dbcf2c686d SHA-256: a0a937e8a047fcc72e7661d15d59db62cb160c9ac065f8f709191eaf4f243830
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 0.9956

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://archism.ru/pbw?utm_term=free+download+gta+vice+city+for+pc+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5fdf2a1a93701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6065fa25c8d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5ffb3f7154434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_60630a5cb9ef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_6006336a6a8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_60be8cd33fa39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60c4d6db4ea81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387421/normal_5feeb4df4e1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60508b63c1647.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/196a8f02-6959-4857-8097-2c1362f9446d/budoxafemixopaxanatetodis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8adbe7-cced-4f6f-928b-5cd0c635ae12/jowodelikuzowev.pdfIn PDF document text
    • http://lokiboz.pbworks.com/w/file/fetch/144904272/dnd_character_sheet_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f21bee5-6be7-4f5e-8ac8-3d48694f01ba/arduino_starter_kit_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667a0a50-a273-4b10-862a-d3982b196723/14261503273.pdfIn PDF document text
    • http://bafakud.pbworks.com/w/file/fetch/145200516/learning_ros_for_robotics_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a275d0-6a3b-43e9-9950-36e07021da46/vagijiwatizinip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8d7798-9f82-43d3-bdc6-1e06df36df2e/77488302550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7967fcb-732b-40aa-b7b9-f3ff8290db04/shrek_william_steig_summary.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/how_to_change_a_docx_file_to_doc_on_mac.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/w/file/fetch/145313271/vesevug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a36f76-cacb-4989-8e07-5b557e1aa743/81308232725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f02904c-4915-43aa-a05d-b90749d4e79d/gator_blades_for_john_deere_60_inch_deck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fde5e4c-82cf-4e57-93cb-733c42c6e510/bangla_islamic_baby_name_book.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/dukadulewozaviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a8d096-aa53-4160-8e09-038d7ea230ea/92175932560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449c1dac-cd17-4525-8b2b-c019aeee5685/dejafalatasexit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e81822-1bd6-4c23-8f44-f0a7a1c21598/why_does_my_candle_flicker_a_lot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a037a70d-02a1-444d-8fd6-7ba692a324fe/serizogopikiziguturutopuw.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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5728 bytes
SHA-256: 4a42c1cef5b71456f44ecbbcdd14813300e2b0579a47a7dc1bd044011303be95
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10300 bytes
SHA-256: 287c690976b7e5112c076da0647485cb06553b511e9576941241736a5f096623

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