Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc77eee3ae2ba4df…

MALICIOUS

PDF

87.5 KB Created: 2021-04-02 21:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dcec1e517d9d37cbef6ad7c6c34a17a2 SHA-1: 7e1c4f6314d77c5d1a23c110097f396abf588784 SHA-256: bc77eee3ae2ba4dfde1c1cb2943aa62c904f171a1a186584030e45b9b3cc8619
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

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://nipisod.ru/strik?utm_term=intro+to+psychology+curriculum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fe875933f4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fe82054893ed.pdfIn PDF document text
    • http://olx-delivery.cc/simple_crochet_scarf_patterns_for_beginnersarsj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_601acbfd2e4b4.pdfIn PDF document text
    • http://trycabinets.xyz/finding_bliss_2009_full_movieqg3jo.pdfIn PDF document text
    • http://se-mrush.com/22513967746awbur.pdfIn PDF document text
    • http://gilogaviteno.iblogger.org/317554512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_6034ced71040b.pdfIn PDF document text
    • http://dkblogin-de.best/34672415296vz3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_605d72c489bb8.pdfIn PDF document text
    • http://luwimifamofuper.iblogger.org/fagukanotejiwotoxox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fe55a95c4373.pdfIn PDF document text
    • http://pay-order.info/19024626152cklw3.pdfIn PDF document text
    • http://tizezs.xyz/llama_de_amor_viva_analisis0q6yo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcce39ae3f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fe6a2a7397ed.pdfIn PDF document text
    • http://muvibigi.22web.org/wordpress_templates_free_2020.pdfIn PDF document text
    • http://vbnmcxz.xyz/351228737921oxu5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fe342a952619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_60655e90a7f71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokijogibosa.epizy.com/dekumumovuguf.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_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 5176 bytes
SHA-256: cae9dc1a98fd9be0e521445fcd31fd8e496ca5caf017532ec323fd857f84389f
font_01_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 10872 bytes
SHA-256: 6887ed2725455aaff920a2ebd5659e6d472716c679175656b80bd447855a9bcb

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