Malicious PDF — malware analysis report

Static analysis result for SHA-256 281b814aaafcf880…

MALICIOUS

PDF

70.0 KB Created: 2021-02-21 01:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c9d40aa840434ea6a970da9b3aaba90e SHA-1: b29e7bf544184a85a990c4d727174e44b328f401 SHA-256: 281b814aaafcf880fba65bae25f137a711463d1313df46837d7917d3d17ee9a9
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, masquerading as a link to engineering books. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall detection profile suggest a phishing or downloader attack pattern.

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://jacksth.ru/123?utm_term=best+books+to+read+for+future+engineers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd653515b522.pdfIn PDF document text
    • http://lisolu.org/509526390377w3pg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6018be28a55b1.pdfIn PDF document text
    • http://com-signto6.xyz/shrek_movie_songs_freemhj56.pdfIn PDF document text
    • http://yildirimotobursa.com/trke_dublaj_ses_dosyas_indirk5844.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fe0409930c50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_6004cfc465cfc.pdfIn PDF document text
    • http://natorg.fun/34565252606a9d9m.pdfIn PDF document text
    • http://recepty-dd.info/libro_pepe_y_teo4q0dd.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/bomupi/52683468876.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/sizesavi.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/beef_cattle_production_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/best_school_bus_pass_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/38358510919.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/jigiwakerewoposokuwisowim.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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 5296 bytes
SHA-256: a1232f024865ff010f6d55b2f25aee13a72c3341da98376cc2fe7062bf5710f3
font_01_sfnt_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 10376 bytes
SHA-256: 05db22b7f7e35f4299bc1408a4afd4d06042c7f692b438816592b4b9b5ce13cd

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