Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f03f74c6289d00…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 17:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 693aab78c1282f3d906c4591ce76963c SHA-1: dfceb0c88d6b12910ea0fef5930cd474593574c0 SHA-256: b6f03f74c6289d00843e2da7d05fe8e872a9d90c174e3fdecc8690fe462abf17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9992

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=the+great+debaters+movie+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601a7d7769cfa.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/92440407009hj6k2.pdfIn PDF document text
    • http://rutefozur.22web.org/wawewej.pdfIn PDF document text
    • http://procripton.com/vutejafopareb92665.pdfIn PDF document text
    • http://vujofinupapido.22web.org/bebuzulosagamu.pdfIn PDF document text
    • http://cheatyou.site/the_rising_of_the_shield_hero_season_2_release_date_english_dubq5bgm.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/Tiahemn/free_shaolin_kung_fu_movies_in_english.pdfIn PDF document text
    • http://vclean-sale.shop/pokenp0bob.pdfIn PDF document text
    • http://todayit.pro/h4350_load_data_6.5_creedmoor_143_eld-xvail1.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/gjbgeTZ/lixufosi.pdfIn PDF document text
    • http://file-id.ru/a_arte_da_guerra_downloadi74z7.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/hcXL5jc/jawomogetigovaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_60003136f3302.pdfIn PDF document text
    • http://ru-en.xyz/23751312074ae6vj.pdfIn PDF document text
    • http://reduslim-europa.site/fewejurakiropokuifjky.pdfIn PDF document text
    • http://helper-badges.com/28090333896fkiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/mgfijmj/bozisaru.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/4hbJGLy/lamarove.pdfIn PDF document text
    • http://igonlinesupport.com/what_is_the_best_phone_system_for_a_small_business7gv3m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevogorusitaw.epizy.com/demuf.pdfIn PDF document text
    • http://gumofiwulova.epizy.com/kisanux.pdfIn PDF document text
    • http://segelomo.epizy.com/laxexitopiwitunarozu.pdfIn PDF document text
    • http://dosunadis.epizy.com/75883382409.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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 5572 bytes
SHA-256: 8703f372dc35864326616ab4f2bcec3e2715a2c1b1a517810a62a9e9df52cafd
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10552 bytes
SHA-256: c455fe19a00a385ae39fcc093324623d3985d5897add15dba119a8f3322c2a51