Malicious PDF — malware analysis report

Static analysis result for SHA-256 487d21d36a3c39cc…

MALICIOUS

PDF

71.5 KB Created: 2021-03-15 15:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f544f50906ed13dc78a3aabc125fd1f9 SHA-1: 6e46f443fcfab8dc7eb73751dd52fe11c7282f3c SHA-256: 487d21d36a3c39cc7d2b29ae151c2de8ef9764240e2825d01677bb6cb2e5cc6f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute traffic to various potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards a spearphishing attachment used to redirect users to these external resources.

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://xezojetit.ru/award?keyword=accelerated+learning+techniques+pdf+brian+tracy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467004/normal_603f40ebd1e5e.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/how_to_master_the_art_of_sales.pdfIn PDF document text
    • https://nuropasidax.weebly.com/uploads/1/3/5/3/135393275/fotapoludife.pdfIn PDF document text
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/lenet-sopevoxok-sisifosi-ropudakelega.pdfIn PDF document text
    • http://shop-kid-toys.online/the_boy_who_harnessed_the_wind_full_movie_download_in_hindi_dubbedlwrfq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5ff2b72126bf7.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/1770734.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/volesininirifita.pdfIn PDF document text
    • http://garant-ritual.online/apple_tv_3rd_generation_app_store_missingvs8lv.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/b2e2844d494829.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/wugagawudovu.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/lonemosibozuxet.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/how_to_download_the_sims_3_on_windows_108co3x.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/d72a5961faaa0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tajiroxajesolut.atwebpages.com/cost_and_management_accounting_lecture_notes.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_58b60394a1124eb58ea9f2a3d0d01390.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_6672955a3c904d6781e1111dcd0f2a90.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_45f9a5a1c2ca4cf5aeb7add9732b5530.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_6820e685545941b7bf7bceee90a858c9.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_f85d1777418a474d9818337c59b0dcb4.pdf?index=trueIn 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 5772 bytes
SHA-256: 8e40d5952159b484d13885b46dd4c45cc43e0cd84ca744d031b1d4600c82a4c8
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10628 bytes
SHA-256: d870f80e3f903eee7fa23c5395378e31e9dcd57d1ae3b79b1f8fe400dd9a5501