Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f779080d7be7836…

MALICIOUS

PDF

72.8 KB Created: 2021-03-04 00:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3517394186c6cb99aaebee81d34acc67 SHA-1: aad09aba7476f1a31072ae97b700f4b00df5bebd SHA-256: 7f779080d7be783696c67ea7c2516adb0f2a0a89efd0f3c9bcf9900da09c07a9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, and contains multiple embedded URLs. One URL, 'https://jumiwimov.ru/wix?keyword=naming+ionic+compounds+worksheet+answers+everett+community+college', is flagged as external. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the presence of commands that could be used to execute payloads, potentially via JavaScript, which is common in malicious PDFs. The document body, though heavily obfuscated, contains text related to a worksheet, aligning with a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/wix?keyword=naming+ionic+compounds+worksheet+answers+everett+community+college PDF link annotation
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/231d2d61119.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/edjeUjj/23858589429.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/4kljcih/64006289719.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/f1A6fjf/dell_alienware_area_51m_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/Tgerhf6/plants_to_keep_mosquitoes_away_from_patio.pdfIn PDF document text
    • https://cdn.sqhk.co/nulupitet/g3igRgj/beast_battle_simulator_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/4kljcih/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/scientific_journal_article_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/37152127367.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/is_windows_powershell_safe.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/bubulazasifukatena.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/rimejiguvif/4_horsemen_wow_vanilla_guide.pdfIn macro / runtime command snippet
    • http://zuvuzevo.atwebpages.com/kosuxegezixi.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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 5776 bytes
SHA-256: 830397f42801d83bee404b005e094cb2215a22f3ca144514e9330d9b0d862c5c
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10328 bytes
SHA-256: 458c0767ebdf16c1b7809de107d4e208aca3d46e4ee091c7c096fa0c7af08ddf

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