Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe1b89d5c4cd899…

MALICIOUS

PDF

76.2 KB Created: 2021-03-02 19:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 938be0a143f3319510f8fe9aeec8ba72 SHA-1: b775da9e4c9a2f755e502ee865905491219b0f00 SHA-256: 0fe1b89d5c4cd89953b7316d17dc587ee19e5dc0611ac38273e10a0aa74d5398
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure malicious links within a large number of seemingly unrelated documents. The primary malicious URL identified is https://resalured.ru/strik?utm_term=black+and+decker+rice+cooker+instructions+brown+rice, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=black+and+decker+rice+cooker+instructions+brown+rice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5fe54f07dbbb0.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/4036643.pdfIn PDF document text
    • https://pekixutub.weebly.com/uploads/1/3/1/4/131453658/174f219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_602f190fc526e.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/ihpBYu5/40263340753.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/lakshmi_ashtothram_lyrics_in_english_with_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_602d3f52ed7f2.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/7482085.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/tazatizogo_divitor_norulajizi.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/7jh89nt/pinikibotupotasibirij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodolipifonabo.epizy.com/math_calculator_plus_apk.pdfIn PDF document text
    • http://ritanuwo.epizy.com/atbu_admission_list.pdfIn PDF document text
    • http://zatibesen.epizy.com/71355745462.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/73775258725.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/soseg.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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 5276 bytes
SHA-256: 2238b373dfdb5a7c29d4f9e1eac35da40dcb7efaa2d8544b1bd5bcb83be4be75
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10784 bytes
SHA-256: d9af59d061531601a26a10981e874d504428378eda47493e7f30a205f93c71ab

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