Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bf5e3e381eaaca…

MALICIOUS

PDF

71.4 KB Created: 2021-03-02 09:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 44a57e292af02f0ac84dd1d5cbda94cf SHA-1: 8fdc36a3aabf35b736f16bfdf2228ff63e438fa1 SHA-256: 04bf5e3e381eaaca8730aea20d6de109dd00eb91183c570106b17a69a74e23c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that redirect to other PDF files hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=rn+work+from+home+jobs+arkansas PDF link annotation
    • https://cdn.sqhk.co/gavezexu/hbjc1Mn/epic_raft_fighting_zombie_shark_survival_mod_apk.pdfIn PDF document text
    • http://epipog.com/adivina_quien_soy_megan_maxwell_resumen2ghd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fd0489018243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_601b9a86a450e.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/does_osha_require_employers_to_pay_for_hard_hats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603c5dc2a9cf6.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/mejasegu_tilanod.pdfIn PDF document text
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/1846169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcbbb3503f74.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/3256905.pdfIn PDF document text
    • https://fisoguxosat.weebly.com/uploads/1/3/2/7/132740182/212418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 5356 bytes
SHA-256: 6d325712e16af31fd51169197692d62d7d8e59071147f1579618f7f1b4f4d6b6
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10940 bytes
SHA-256: a2b245c25e187fa7322f4c233cc774d4098ccceb3df2a06bf1d032d4e9b498d8

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