Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2503fbcf38a1e2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-15 11:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4765314056a9fb517f18207b08ac1053 SHA-1: 56b0a592acf5a0e5381a53701de6102f90fe8302 SHA-256: 7c2503fbcf38a1e2cf3dce3bf4c4dddff5d2ae945d0bb3ef8bcf96203a04030c
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'math anxiety test pdf'. The presence of multiple unknown URLs, particularly 'https://botokaw.ru/award?keyword=math+anxiety+test+pdf', strongly suggests these are used for delivering secondary payloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=math+anxiety+test+pdf PDF link annotation
    • http://xozonline.ru/497223114272t60a.pdfIn PDF document text
    • http://streamsweets.com/zajulab9dc3u.pdfIn PDF document text
    • http://arendagg.xyz/the_new_roommate_imdbc7fuc.pdfIn PDF document text
    • http://nubolutlion.xyz/epic_emr_user_manualijywj.pdfIn PDF document text
    • http://gelchlen.fun/forano3u2v8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5ff06978bcc84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_60055dd7d998d.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/qjagghg/make_a_price_list_online.pdfIn PDF document text
    • http://slimitalia.space/wixela_inhaler_how_to_usew62xe.pdfIn PDF document text
    • https://cdn.sqhk.co/gonibowijum/Jhfgdqj/auditing_standards_for_ipcc.pdfIn PDF document text
    • http://qwertyujg.xyz/khutbah_al_haajahl1ndb.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/fjjpgh9/31376669765.pdfIn PDF document text
    • http://vovality.club/mike_v_skateboard_party_pro_apkpurep9xmw.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/tugumeb/interview_questions_and_answers_on_conflict_management.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/contemplated_by_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/32422531932.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/25503209520.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/lunuwefab.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/red_wine_for_beginners_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/article_about_health.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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 5176 bytes
SHA-256: 3e3331d3b7bd273656feae3ad0ebca7e4e805bdb1cc4275e9a05677167cff45e
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10712 bytes
SHA-256: 8a529ec3f4515bce17f18393090d690827b11836bc0286f50fdea54061faafaf

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