Malicious PDF — malware analysis report

Static analysis result for SHA-256 0635351af2a5438b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 14:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ff208804012d40f099ed13c845679d08 SHA-1: c319badb77997eadad48109d80a131e6572e22ba SHA-256: 0635351af2a5438bf7d4e8d72907e36441048831f3684463568625537a7770a8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including a suspicious one hosted on 'soxebez.ru', suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=baby+grinch+doll+walmart PDF link annotation
    • http://tupujetu.sportsontheweb.net/17803965083.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/ametropias_oculares.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/construction_project_management_jobs_nyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_5a75d7ed7d0443a291e39c82e22c5e66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/22980135088.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/ambassadors_of_christ_songs_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6f0f8f-f9db-4b9a-a1b2-574ba672f2cd/29442652158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8100a122-7043-4a8a-8f6e-e3ed7915ce24/little_black_boy_haircuts_with_braids.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_0575ccb9e19244a3ab7e01047d607302.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/activated_carbon_adsorption_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec509d0-028e-4d92-a1ca-a21069021e96/8875522968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937cc796-8392-4a90-897f-9d6734537e83/singer_4423_vs_4432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c72e4c7-6d85-4f01-aaab-c37c62d5ff82/samsung_m2880fw_toner_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648c1e17-4875-43b7-9bee-853f4b24598c/gakepizezigevewuxejux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be3759c-09e0-4312-adf3-3c20ba5302c8/best_scroll_saw_blades_for_puzzles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d26e787-b8eb-4280-8060-8d58f85c24ce/is_final_fantasy_7_on_ps5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181b439f-3400-4f89-8498-252d1a51889d/what_is_the_best_bait_for_striped_bass_fishing.pdfIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/retodugelipulova.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_8ba3f0d2e57f4cd4a357aad625a5473f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6958f8c-cf95-4a9d-b33d-ace5abe34cc1/kadep.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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5556 bytes
SHA-256: c27075103edead25645f67f4ac7127b7fc2830f19f75f6c2fec888989860aa22
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 11336 bytes
SHA-256: 53f50178755702200e2f605ec6af3d2c98f4bda5704b9f4d907df2a69df1d645
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16204 bytes
SHA-256: f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce