Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58589292bfb54dd…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 16:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f0449c24fb531144778011e10d0370fa SHA-1: f1040865e73da37c1ee864ff4df8c45756c93940 SHA-256: e58589292bfb54dd411d3c56cb79fab3429adf8629472df80137989bab7e450c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://maypoin.ru/wix?keyword=natural+selection+and+horse+evolution+worksheet+answers PDF link annotation
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/wepivebomumefanag.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/vikulobaxugofi.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/4iiiaZt/idle_island_mod_apk_1._03._021.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/7dc60407b.pdfIn PDF document text
    • https://fadoxidibeja.weebly.com/uploads/1/3/2/6/132695582/7261187.pdfIn PDF document text
    • https://cdn.sqhk.co/sexasegavon/a2fifby/62042798180.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/hjljijj/75508452677.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/denukemexokep.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/lR0jbNg/gun_builder_elite_online.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/letapapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/development_planning.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/letra_del_himno_nacional_mexicano_original_completo.pdfIn PDF document text
    • http://xezorepolik.epizy.com/how_to_crate_train_stubborn_dogs.pdfIn PDF document text
    • http://tununik.epizy.com/dstv_tv_guide_compact_plus.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5212 bytes
SHA-256: 468f9da4f7664d0133df0bce795effd47d7f7361aab4b0755b51f91e074c6219
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 9956 bytes
SHA-256: c3bf4916b8c32a581d02a99fc492e422dde91603f00a877991654ff25e5624df

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