Malicious PDF — malware analysis report

Static analysis result for SHA-256 745019142363fa0c…

MALICIOUS

PDF

87.1 KB Created: 2021-03-01 01:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aba368249be84400fd59d924cfad50b9 SHA-1: a5021f3ac08257bba044d948d4f5392d937cfb18 SHA-256: 745019142363fa0c0928887a235fd5d7a5a05c6675e1e149ca2778792ef74126
66 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or used for link farming. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to mislead users. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=how+to+display+response+data+in+react+js PDF link annotation
    • http://montana-media.com/english_christian_songs_audio_free1kbei.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/mini_jambox_connect_to_iphone.pdfIn PDF document text
    • http://regsenatvumen.website/42922118045ixlbm.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/wsjjjjY/95707827172.pdfIn PDF document text
    • http://klyshsheff.xyz/what_is_financial_literacy_weekaxgkt.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/volesininirifita.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/dHgghhk/wivolijajozixiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5fe490d4be5ee.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/how_to_change_day_in_casio_g_shock.pdfIn PDF document text
    • http://marketeuro.pro/64292906806x39xu.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/19907194441esp37.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/qihgfTT/wipikuxetijobufalexasekaz.pdfIn PDF document text
    • http://bettermoneytips.com/bepubirawuwexirinoxukuw98hwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603b1713ca6f7.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/czlm8gi/56118182991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_6008da5536beb.pdfIn PDF document text
    • http://idealicaitalia-official.site/xidopuwokalarmhgr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/47559015464.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_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 5300 bytes
SHA-256: d6e55b95cc763410d5724bec440149f56124ff33732316767cc3236c66b5767c
font_01_sfnt_off00012695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 11852 bytes
SHA-256: c4864be608116afb729717a0670f5b76a615a27bb23f8c0c4284bc7b2dcd5d48