Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e57aa308d7caa2…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 03:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5a6c1d3d2ca311cf2254340b7e20245d SHA-1: abaffa28532ff10180f07d8c082e6c135aa3a182 SHA-256: a5e57aa308d7caa2cdc2dd4d8fdcb2fbca84577dc1e0c2276b1a6f92b300265c
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://xezojetit.ru/strik?utm_term=how+to+download+hearts+of+iron+iv+for+free', suggests a lure for pirated software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+download+hearts+of+iron+iv+for+free PDF link annotation
    • http://dorutote.scienceontheweb.net/medical_laboratory_test_book.pdfIn PDF document text
    • http://merutakozuxonu.22web.org/never_back_down_movie_hd_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/6ggragh/54061365565.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/jshcYgf/fishing_break_app_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445107/normal_5febf4a287449.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/sahgghr/dragon_blaze_arcade_rom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fda6158e035d.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/bubapumon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5ff2d6632e733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_6008e032de09c.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/lTjgidu/55604485954.pdfIn PDF document text
    • https://cdn.sqhk.co/nitaroxujedi/gahgjiT/bafazurakolezufe.pdfIn PDF document text
    • http://nasamipow.22web.org/baxter_6201_infusion_pump_service_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5ff46e6fbe1be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiroxidimov.rf.gd/napevima.pdfIn PDF document text
    • http://vedisupekak.epizy.com/genunamis.pdfIn PDF document text
    • http://pujusojup.epizy.com/xosesurewidenukerawi.pdfIn PDF document text
    • http://xikusizaferawev.rf.gd/zidafiwunebebotiv.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/kavomis.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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 5108 bytes
SHA-256: b848c1f17acb46760f1e58f2a04af1eedc84633b1fd240d2d5f611ab43829422
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 11108 bytes
SHA-256: 8b179b04f5a6cbf019fc37b9632fc9d65bd033c46a616543b04136be8120ff1e

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