Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5846438c1b1a064…

MALICIOUS

PDF

77.9 KB Created: 2021-05-13 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aeed222651720b97ace03ae17a505c49 SHA-1: dffa6460549c29eb3debe9cf4266aae8db3190e2 SHA-256: f5846438c1b1a0648a47adc5888217d8d2d6fada2f35792b2481bbd33d5806cf
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 0.9997

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://lozipotod.ru/strik?utm_term=dave+holland+conference+of+the+birds+full+album PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd79448413e0.pdfIn PDF document text
    • http://salonlabs.xyz/how_to_convert_google_books_to354fj.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/catalogo_cores_suvinil.pdfIn PDF document text
    • http://drive4mclaneaustell.com/868096477814zqtg.pdfIn PDF document text
    • http://stalekost.site/23192001097hzj9u.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/ayatul_kursi_in_arabic.pdfIn PDF document text
    • http://tortomsk.ru/2594424064z1pkh.pdfIn PDF document text
    • http://supfitket.buzz/29119708984eco3g.pdfIn PDF document text
    • http://merovew.xyz/83566133337zth08.pdfIn PDF document text
    • http://tohld.in/4212440305087ryy.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/how_to_make_chicken_jerky_with_dehydrator.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/j2je5Mp/43854140473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5ff219dfa4337.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/88249653477.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/ejjhrjg/82480083184.pdfIn PDF document text
    • http://recepty-dd.info/how_to_do_a_roman_toga_costumeky9bv.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/fruibjf/regukuvekozilerikirenik.pdfIn PDF document text
    • http://copyright-services-us.com/wonojapeviwajizsw3cp.pdfIn PDF document text
    • http://edayafar.xyz/how_to_clean_edgestar_ice_makernbb7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fidikaxano.myartsonline.com/jizatisuvuzobukinobatov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5344 bytes
SHA-256: e25992479f43cd65f6aa364590c80a98969e8343bdacbca8a652cc5e1ba49239
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10984 bytes
SHA-256: 077cf3924c4f483c1e20e19fa15fba88daf1d66ab534c3518268d13492beab86
font_02_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361