Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2feb5a1e9713c41…

MALICIOUS

PDF

68.0 KB Created: 2021-02-14 14:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 38f0ead0bbcbbe22986f723d49ca866e SHA-1: 493ef4792083bfd9d9b27ac4a69016ab0ac69b5a SHA-256: b2feb5a1e9713c41e5547aa542aba9bf2f59f94f4cc734a5556b2a3a74b7fd44
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded URL that leads to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/123?utm_term=heritage+high+school+leesburg+va+calendar PDF link annotation
    • http://zajowidased.iblogger.org/ethiopian_reporter_amharic_news_letter.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/beminibokokozeg.pdfIn PDF document text
    • http://femuloririv.iblogger.org/13715011924.pdfIn PDF document text
    • http://vifepixakusuped.iblogger.org/bach_goes_to_town_sheet_music_clarinet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xisapedugifado.epizy.com/bluestacks_3_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/pdf_splitter_merger_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/56788930442.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/68369757006.pdfIn PDF document text
    • http://wovotunuvovon.epizy.com/masusiso.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/34851990028.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/jedinarux.pdfIn PDF document text
    • http://zafurug.epizy.com/obstetric_cholestasis_nhs_guidelines.pdfIn PDF document text
    • http://xuxusemo.epizy.com/dominions_5_beginner_guide.pdfIn PDF document text
    • http://bapuguxu.rf.gd/translation_rotation_reflection_dilation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/38774216012.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/76953252448.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/93063466318.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/what_is_categorical_syllogism.pdfIn PDF document text
    • http://bapinusajix.rf.gd/coliform_bacteria_count.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/alita_battle_angel_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/video_er_for_mac_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/17585809125.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/34411946814.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_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 5364 bytes
SHA-256: 7517fdd6f20876e5d59396790c6b944d1fd7cd521df3ba0251ed7498478217a6
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 10940 bytes
SHA-256: 2f4122cfb6c86473f7684a5a3a396f63982b7b27af233b347968df9e7cbbfc29

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