Malicious PDF — malware analysis report

Static analysis result for SHA-256 417e686e0b27ea3d…

MALICIOUS

PDF

74.9 KB Created: 2021-05-11 13:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3dcb0a794ba1801bc31b62859afa8752 SHA-1: 90e97c80c6c937899f8690df5cc41469d7b6cc8b SHA-256: 417e686e0b27ea3db66b4bb1634f13fe600542bcebe41894217a3972bf5cfee3
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/strik?utm_term=what+is+tomorrow%2527s+international+news PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5fe3131d8e604.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/arun_sharma_data_interpretation_download.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/personal_object_pronouns_and_possessive_adjectives_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_6034c5cfe9efc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fc7e9dfbf8c3.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/zujebaronajufejuteb.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/70123269481.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pobubaroxenitiked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6061c385e2e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_6014c549eb270.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/c9f1eefb19eaa.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/kagedatabujo/celf_5_score_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57cabc4-fa70-455b-aca7-aaee9bf4d9cf/70411879065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15496e85-4456-4664-ba3f-5b25f4255ab3/26321363730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c17e4a-3967-42aa-914e-24550d2f843e/97940753240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c979ed-e2cd-4da0-90a4-f1af2e74099d/27533218184.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/harry_potter_platform_9_3_4_scene.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/69998556825.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/adavilo_abhimanyudu_naa_songs.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/definition_of_business_process.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/sindrome_de_apnea_obstructiva_del_sueo_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/how_to_adjust_schwinn_bike_handlebars.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5064 bytes
SHA-256: ba429d74a5990dc202e18c22a81be3372606b1c8d1777e931ab3e64e1043b804
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11200 bytes
SHA-256: d43ec729896ef3f641f66132bdd9cb6c6dcdcced65148fb4bdd3a07b760847f6