Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab2ffd47c2b387c…

MALICIOUS

PDF

85.1 KB Created: 2021-06-10 18:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fbc75168e830b2df2fb02b409237f198 SHA-1: ce049445e67b55d7be891cd22bd390f21baf7cbc SHA-256: cab2ffd47c2b387c016e9aba262df37383d071ffaeec0f322a1775296c9476cb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9983

Heuristics 6

  • 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 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://laborke.ru/pbw?utm_term=principles+of+economics+an+asian+edition PDF link annotation
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/jurejixudu-lokuremigi-dusobiwivuw.pdfIn PDF document text
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/fikulizugavikikar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144809619/62996417226.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/calculo_de_una_variable_james_stewart_solucionario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe3343-394d-4ecb-801c-8e299a315031/communist_manifesto_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919ae897-a726-47b5-bc2a-3a45ab1e892d/21567698231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287fc152-acdd-4917-ba9f-38c9c24169ea/bejekasifodapinulozefanam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71adef2b-f50e-4784-8b6c-5da137d7b439/77290287002.pdfIn PDF document text
    • http://zejokij.pbworks.com/f/risimasuveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becaad59-2ada-4d61-827c-a090fd7840e2/81493210175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717fd119-0345-47bb-bc44-d723be61f387/you_write_1_million_in_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2bc4e2-bb08-42e9-b915-bc1c5c452880/sagojof.pdfIn PDF document text
    • http://vomokig.pbworks.com/w/file/fetch/144887391/grade_10_english_book_download.pdfIn PDF document text
    • http://kuzukiwirimi.pbworks.com/w/file/fetch/144905139/file_game_ps2.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/25679202601.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/how_to_make_a_ragdoll_script_in_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccfd398-f70a-45c1-886b-f77908a28aea/jimikiwusiloxaxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b42ded-86b1-4cf1-b97e-fa26d34af5f9/when_nietzsche_wept_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f6d319-7ed2-4946-98c2-a3d3eb0e867c/42753910859.pdfIn PDF document text
    • http://polujare.pbworks.com/f/abies_canadensis_materia_medica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0b8fea-403c-4278-9677-26206dee5dc1/vogegusozirezanufeteto.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/nogewupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e83fea-925e-4eb3-b71e-172b69b3cca3/naruto_run_game_download_for_android_mobile.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144728097/wefufijijep.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 5300 bytes
SHA-256: 5be55ad209d9c8fbf2ded5ae6d7ef7c76358ff49624edd80a691539e3dbbb6c6
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 11304 bytes
SHA-256: 8207934e73c54d0a6af7b09433e4ca06f89bf6b072cae4468af1077ee42e14e2
font_03_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 10320 bytes
SHA-256: 66f77faec9d40b53db2c472fa93614b053bb8176c2690b35fee8c86a9714a0b6