Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27dd698df46e1d7…

MALICIOUS

PDF

80.8 KB Created: 2021-03-30 00:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a13d009a6c9d13cf1c6b55aa58404c SHA-1: d44c276217f2ea3ad2f32c3ac3d3e36db9e21d14 SHA-256: e27dd698df46e1d7b2b41613d5b90c4b9601add298fb152fd30de138a8ace2ca
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a deliberate attempt to obscure malicious destinations.

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://pelibifir.ru/strik?utm_term=hae+min+lee+height
    • http://xevusezes.medianewsonline.com/14972404355.pdf
    • http://gaxesujite.medianewsonline.com/envision_math_6th_grade_workbook_answers.pdf
    • http://niwadeg.mywebcommunity.org/angelica_liddell.pdf
    • http://kijekidajefi.getenjoyment.net/xokisesusavefito.pdf
    • http://jamotovoxut.mywebcommunity.org/how_to_trade_stock_youtube.pdf
    • http://wosedumuf.mywebcommunity.org/kewulumi.pdf
    • http://wozuxel.getenjoyment.net/6119114448.pdf
    • http://fitnesspack.net/rinnai_electric_hot_water_heater_pricestvsim.pdf
    • http://helpverifedbadges.com/8889261830242jpr.pdf
    • http://mamontov-net.cc/43269554704uzrdw.pdf
    • http://bivitajuteje.mypressonline.com/72665421635.pdf
    • http://mapotilij.mygamesonline.org/curso_aprendizajes_clave_ingles.pdf
    • http://nibelv.xyz/graphic_design_portfolio_examples_behancey3hpf.pdf
    • http://biggymstoe.com/6832103805727rs5.pdf
    • http://zixudivibudizu.scienceontheweb.net/partial_least_squares_discriminant_analysis.pdf
    • http://idealicagocce.site/nyssma_all_state_2019_datesi9hfx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijadogif.atwebpages.com/35916158315.pdf
    • http://zeteximezoxa.myartsonline.com/8359064188.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ce.bin
b56c78c8fe175078de1b4482ca1ef7987d0780b467825ce7fef70e5aee3b1932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 3268 bytes
font_01_sfnt_off00010089.bin
b4c55099805ca28e983228466dda230eec223a4df75b726f2391e74bb8e832a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 4784 bytes
font_02_sfnt_off000110a9.bin
4f3a2b8e3a0bab43ed7a5630a5f41fc8b156a39cfb58f8421636df201522cb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10968 bytes

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