Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d18839f9af0a6e…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 19:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a7d5652be55cf01a14892ec865a52c8 SHA-1: 777acb793892320df4ce5359f8234cab29d8b8ba SHA-256: b4d18839f9af0a6e8daa0134f0acff962ec5830ec6a38d90a0e6b4a3e5b51190
96 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that mimics a search result for a game hack, likely intended to trick users into downloading a payload. The document body, though heavily obfuscated, contains references to the game and the wkhtmltopdf tool, suggesting it was generated programmatically to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=hungry+shark+evolution+apk+hack+mod
    • http://freshnatur.fun/jimogudadupadiralu6qp6g.pdf
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/nuwove.pdf
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602eda5e75c39.pdf
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/5fbd169fcb.pdf
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/xifoziso-wajapewob-jukuvuxo-muxisavirujit.pdf
    • http://zozamowewideno.mypressonline.com/oxford_advanced_learner_s_english_dictionary.pdf
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/xufirudexorobi.pdf
    • http://buzevuzelape.mywebcommunity.org/96276463875.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_6030ebfc04ffe.pdf
    • http://trafikcezaodebayisi.com/compare_and_contrast_prokaryotic_and_eukaryotic_cells_using_a_venn_diagram5tl13.pdf
    • http://mamontov-net.cc/327709313070b83o.pdf
    • https://static.s123-cdn-static.com/uploads/4413697/normal_60058d5ef0b9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bodirinukamole.onlinewebshop.net/beta_glucano.pdf
    • http://lixugafepujijoj.onlinewebshop.net/16412528022.pdf
    • http://futakanawus.onlinewebshop.net/78845147047.pdf
    • http://kuxoxokazutuv.myartsonline.com/butodisekizomegalapixiben.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb0.bin
aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 2880 bytes
font_01_sfnt_off0000f8ee.bin
c91dd8a75e9d0d6e9b489c6c87b57fd57152e783bc6657327979d2542801974d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 5556 bytes
font_02_sfnt_off00010ba7.bin
72c4fb03e5af28c622508cc492fd13914092d43b92422cd1d51d4d60de981ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 13548 bytes
font_03_sfnt_off00013427.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 4324 bytes

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