Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c75f484d5cb583…

MALICIOUS

PDF

75.7 KB Created: 2021-03-08 02:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 006a33cb5fb2b5a3efe5214b32f7de6c SHA-1: 60777f17c5168341e989c20b6e5f20203465b45d SHA-256: d4c75f484d5cb58373dcce2c07161a71acadc9bc8568dee14db9b6ccb054e5e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by an ML classifier as malicious and contains a large number of external links, many pointing to other PDF files. This behavior is consistent with a link farm used for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/123?utm_term=what+are+the+4+types+of+conflicts PDF link annotation
    • https://cdn.sqhk.co/tezabulaw/iiicbRN/marketing_plan_executive_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/ieiaTHk/wolf_wallpaper_hd_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jhmIBxa/24942964271.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/nogeEl8/pelusisalujaredo.pdfIn PDF document text
    • http://pobijubak.iblogger.org/29832850735.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/do_you_capitalize_than_in_a_title.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/gcXUihy/hungry_shark_world_cheats_mod_apk.pdfIn PDF document text
    • http://wipineda.iblogger.org/52945450402.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/data_science_degree_online_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/jdwNheS/repost_instagram_video_app.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/sinadi/jonudawudijemi.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/reservation_cancellation_letter_format.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_35d56060e849459698130d85a83dd17f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/xusugafewalixumekow.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_35e0ce1f816644c8a14d545ff1084b39.pdf?index=trueIn PDF document text
    • http://palezonipegodaf.epizy.com/48318133608.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/external_style_sheet_advantages.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/convert_multiple_excel_sheets_to_vba.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/40821930315.pdfIn PDF document text
    • http://rigemileluzed.epizy.com/12008688686.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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5308 bytes
SHA-256: 4f07429394a36f8bea1fb0abe73ef65949206282d53f16c9cdb418ce64dca40b
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10008 bytes
SHA-256: 0d2d17a58d36faccc869459bc5e6a87bb477ca429a22cecb72c282c733635cb3

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