Malicious PDF — malware analysis report

Static analysis result for SHA-256 c710cfe7a6dedf34…

MALICIOUS

PDF

73.0 KB Created: 2021-02-10 10:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 53f76aa3b5142fa73c01bf11351c2d8d SHA-1: f505b66efc5f896b8225904af5fbb08d8a202290 SHA-256: c710cfe7a6dedf34e811027c20a12c91d01118a1baea7fadb2e6e30e4ddeec0e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'sleep apnea test questions pdf', suggesting a lure. An external URI pointing to 'jottigo.ru' was also extracted, likely serving as the redirection target for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=sleep%20apnea%20test%20questions%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405186/normal_6001ebfaa79c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fece614ede4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_5fd73c30a0234.pdfIn PDF document text
    • http://puruzil.iblogger.org/59254370801.pdfIn PDF document text
    • http://pshcomonhere.xyz/loksatta_epaper_puneudtz9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_6004eb4d2f47e.pdfIn PDF document text
    • http://yewes.space/pegusalufanemaoe4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fdea0018720c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_6015adb34834e.pdfIn PDF document text
    • http://options.expert/run_3_unblocked_cool_mathpnn9x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60144ca559584.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/mejigavukolu/millennium_development_goals_mdg_report_2015_india.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/divafovupemazopirosi.pdfIn PDF document text
    • http://jevoxomififewi.epizy.com/buena_vista_social_club_album_zip.pdfIn PDF document text
    • http://dibibum.epizy.com/nabom.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/duxigavexew.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/ratewumav.pdfIn PDF document text
    • http://xonekalanalu.epizy.com/vowels_worksheets_for_sr_kg.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/durufora.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5168 bytes
SHA-256: 3ba7bc659c45ec00a77a89cb4f0334058ffd083d40bde0e5fb05b817c755a182
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10076 bytes
SHA-256: 192fbf3f928b9d26b8ede8faa884857ae608a5b43a4b794c610d52133ef2da6a

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