Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f82c0119ac433…

MALICIOUS

PDF

78.9 KB Created: 2021-02-21 22:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8e68699c93661483e3ff153edd283ecc SHA-1: 1b71230f8de3fe27e11040561308bcac6084a503 SHA-256: 7a1f82c0119ac433cc24f1e890a9675399deb95f59ddcb47643647f99c5dc5d6
116 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jottigo.ru/wix?keyword=empires+and+puzzles+wanted+mission+fire', suggesting a lure related to the game 'Empires and Puzzles'. The malformed stream length heuristic further supports the presence of malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful content.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/wix?keyword=empires+and+puzzles+wanted+mission+fire PDF link annotation
    • http://hairsprof.ru/57644552337mupgq.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/neigijj/50738756996.pdfIn PDF document text
    • https://cdn.sqhk.co/wofamofupu/g570Cjl/genius_killer_2.pdfIn PDF document text
    • http://all-host.site/addition_et_soustraction_des_nombres_dcimaux_cm1rpbvs.pdfIn PDF document text
    • http://makamar.xyz/guns_of_glory_game_guidevxee7.pdfIn PDF document text
    • http://mattelipsticks.site/darlinghurst_school_ofsted_report_20168if6e.pdfIn PDF document text
    • http://expo-kit.ru/act_up_clean_versionsk6qh.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/kEihjgf/minecraft_parkour_jumps_list.pdfIn PDF document text
    • http://tryici.xyz/xopopedodosokekisej27ek.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/43643005603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firudegix/jefamaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/slack_app_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/abridged_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/30758590823.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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 5288 bytes
SHA-256: 45762b557f2892c3d25e3ebda63b6fdb14091df1b5bc4d7958acf52183a02ee8
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 10588 bytes
SHA-256: ea386ea886df975f9edb2b68b40531f6f53bf96ffd7eee4c335f1de107ec158d

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