Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5a973756fd113c…

MALICIOUS

PDF

76.2 KB Created: 2021-05-01 01:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bdd640df4287909b05eab3e9e7196510 SHA-1: e093d7298265faaa35673fb3b72e1b33f1a65bf5 SHA-256: 4f5a973756fd113c8ff33f79ee70e33c2d7c38319118c0d6eb8783f60ae88a03
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and external links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=sacred+pathways+book+summary PDF link annotation
    • http://walkover.me/one_punch_man_season_2_episode_13_sub_espaol_facebookyja1z.pdfIn PDF document text
    • http://instahelpforbusiness.com/kururitofulegarifirubad6tju0.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/9d769.pdfIn PDF document text
    • http://123dutch.com/89527577182a0q1u.pdfIn PDF document text
    • http://podarokinsta24.online/shopping_list_for_alkaline_dietv4b3c.pdfIn PDF document text
    • https://rizogogitire.weebly.com/uploads/1/3/5/3/135323834/boxivipoferi_sasuxurop_bawisedo_waxepas.pdfIn PDF document text
    • http://ladyso.ru/delta_34-444_specsc98gg.pdfIn PDF document text
    • http://startbastar.online/2005_honda_pilot_service_manuala29nm.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/745caa91-a1b7-4328-aa4b-f8154b8491ed/dipazavoluleweropulak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38929464-1915-4c1d-8d94-84c021aea5ae/alert_1_medical_alert_reviews.pdfIn PDF document text
    • http://ropisobe.epizy.com/41359259030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f304e87-158c-483b-8723-78996d9bcd59/ukulele_music_sheet_for_beginners.pdfIn PDF document text
    • http://wisubiko.rf.gd/aha_antiarrhythmic_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1a3aa5-c88f-4e23-be51-58915fe59160/bopabuxajulenojisuf.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/job_interview_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc2123d-9620-4deb-b39b-09c060a8ee86/samsung_aquajet_vrt_nf_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01361992-235f-4da7-89e9-09479e59d084/24860376699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84357695-bf4a-49dc-ac2d-73fbc65cc405/td_jakes_books_amazon.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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 5784 bytes
SHA-256: 477fcca68e65d029bc84d621510529d09937f7465230170ddbdf7ded53c7d89a
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 11384 bytes
SHA-256: 47645bd339f2956e45defb220ec753923f3a6ebf9a151826d2b9fef7b5a355ae

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