Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed1546a5def7a63…

MALICIOUS

PDF

68.2 KB Created: 2021-02-18 08:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22e1f1148544d00f2c2100c6f242c93b SHA-1: eea24482917b1660f104e1049589f5e173b3892f SHA-256: 1ed1546a5def7a630501767c51ef7a7d3a08c21c0675f90d9546aedf0d58e4c8
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a resource that likely serves a malicious PDF, disguised as educational content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=pearson+geometry+common+core+workbook+pdf PDF link annotation
    • https://cdn.sqhk.co/mifodirula/uXxjfTf/fuvegawofudekamadis.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/iOhjhat/dish_anywhere_app_for_windows_10.pdfIn PDF document text
    • http://1freedom.space/climbing_away_spainh6ub7.pdfIn PDF document text
    • http://prodive.su/rilukutizuxuporixuf1tahp.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/3l1enXq/75894387353.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/jhihBha/13348379172.pdfIn PDF document text
    • http://ukranews.icu/554270481076ulqe.pdfIn PDF document text
    • http://kernig.store/bituladugibiw1esme.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/ierjgjj/all_star_ice_hockey_desktop_game_series.pdfIn PDF document text
    • http://ersoil.fun/witegazzvuy.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/wiremeresegikon/96182768503.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/depipusoludumerenoponev.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/67037635939.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/86471533064.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/implicit_differentiation_worksheet_for_calculus_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/30409064177.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_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 5840 bytes
SHA-256: 4290804152dd3079d7379e4204081e121f7b97133bba94f093d51191297c4156
font_01_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 12116 bytes
SHA-256: dbde491b971f0b74be8faa53c1c4c9f91499ec7e99a981f41cf8fbb170719287

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