Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19454f668a62f27…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 13:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6aa361621ca8af7eb9fff1e996751a19 SHA-1: 91193cc5c53fc931425823fa14595e9d19bc4079 SHA-256: f19454f668a62f2709486f9dbf00a6b7fc79770a0a2312873317a5052939389a
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 0.9954

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://soxebez.ru/strik?utm_term=brayboy+toward+a+tribal+critical+race+theory+in+education PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5ff27bb2b19fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_604305b651f11.pdfIn PDF document text
    • http://jibinomazovujug.22web.org/types_of_houses_worksheet_grade_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fe10aa1713c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_60586a44771d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_60482670a620d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_604cbe4dc165a.pdfIn PDF document text
    • http://dokelamalide.iblogger.org/35845746804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_60175f90cf99f.pdfIn PDF document text
    • http://ralanizu.iblogger.org/invoice_print_template_odoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_6024b9e2ca60d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5fecad3bef8c5.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/5529a2aa-ce3f-47da-87e8-09c67bb724da/20638079033.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/aankhein_teri_kitni_hasi_audio_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4afa6b-3740-42fc-b686-a45ae44593a9/thetford_toilet_valve.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/96227020246.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/shinee_1st_album.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_3819215110354f479521221fe7ccd88f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/40343788398.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_df13763eb34a496ba4185c13e92da208.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a7b61b-5e4e-445f-8309-0a018279b2cf/epson_xp_620_ink_replacement.pdfIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_f74e57819ceb47599f53e3f5ee33d393.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/street_fighter_4_apk_full_version.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_58bbba108c6e4846a97fe4fab96c6e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a93a927-c90c-4924-af9d-87551367d103/83548500949.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/investor_relations_information_definition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 5232 bytes
SHA-256: 5a9d34c30216acd0a9faad162092cf4f2252e243ed77962992108d74e334c2ec
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 11692 bytes
SHA-256: 091b1867872d52561895c43314fbfca9ee77940975ab20a077dd611d9ee3a6f8
font_02_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e