Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6ba35f18c27acf…

MALICIOUS

PDF

77.7 KB Created: 2021-03-13 13:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0af55af2cf15a75b8e21787095e6d912 SHA-1: 9023833dd4e9fb3dfad29957efe2f0715299deec SHA-256: fd6ba35f18c27acfbb2a1026b6581f87b93a861e99ae81e5d887c1de4f44ec69
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 0.9996

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://dugedepap.ru/strik?utm_term=schriftband+f%25C3%25BCr+brother+p-touch+h100r PDF link annotation
    • https://nobenore.weebly.com/uploads/1/3/2/6/132696051/satema-fusoragorefe-sumaxobix-gigavusawel.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/igf6rhw/custom_cast_app_pc.pdfIn PDF document text
    • https://segamovav.weebly.com/uploads/1/3/4/8/134892249/11ce7d953.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/xutedewe.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/hdwCyWT/symmetry_board_casual_memory_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/oZohenH/guy_pressing_red_button_meme.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/2782761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b052190d-4da6-479f-9713-988b5e33931e/how_long_does_a_maytag_bravos_washer_last.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_df1bc91421ce4a1987bbc8127e827f2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbf9701-646d-4f20-a088-c54856daaa74/the_iliad_and_the_odyssey_book_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfbe8f0-27e5-4de8-acf7-cbd2a2ac3b25/73783843084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b8dcd1-5183-4819-9879-d9ca5e5fd707/59650712362.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_9a4438077ea54b4fb7677ad2c883a4ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9924f82-7b53-4dd8-b6f8-3e8319fab48a/72829114012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329d22e9-73c1-4d5a-8ced-22d57cb517a9/dolujiwipazitat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc503b5-1e6b-4394-8b85-f49d6d70b374/redhead_dehydrator_replacement_trays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10881031-1c85-4c23-bf08-30e98e0f6e17/born_a_crime_movie_lupita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23811e7-26a8-49e6-b11d-3f3ff13064db/29175292119.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 3048 bytes
SHA-256: 424e247d1873242018db1912b091de578abc6f257080a181f7016aa2773b360f
font_01_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 5504 bytes
SHA-256: 696d2d8967f03f1f393c13c80099421c9edb1e74ec5ea8dc443fc73738b60271
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 11896 bytes
SHA-256: fdbfa78dd0dc247183d20a0666f638c05705ebb450bf11d27c931e80cacf8701
font_03_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34