Malicious PDF — malware analysis report

Static analysis result for SHA-256 087488b5559b3389…

MALICIOUS

PDF

70.4 KB Created: 2021-02-05 01:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 15ae545b240b4c90d464cd62f6753792 SHA-1: 16f9c0512241d74fc6e6eda7764f647ed72558e9 SHA-256: 087488b5559b33893fe70af8466ed683db03e993281802717c3dc39a6e91ae6d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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=prime+and+composite In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424662/normal_5fd9aebf76a5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/jhxieLT/gin_rummy_plus_unlimited_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/siduniberame/ghjbhbO/42107408178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601bfdccd10f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fc84470f1699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_6004cb3a71a0c.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/bzMgcIY/linkedin_careers_human_resources.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://porojerosisogu.rf.gd/geometry_dash_chrome_web_store.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/ficha_tecnica_do_cerato_2011_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/rivefovokejejavipewaromil.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/lulupojunelewamafuke.pdfIn PDF document text
    • http://bewojux.epizy.com/38734548242.pdfIn PDF document text
    • http://deroselewem.epizy.com/adverbs_and_adjectives_worksheets_grade_5.pdfIn PDF document text
    • http://penevebepor.epizy.com/tarerape.pdfIn PDF document text
    • http://suwutosu.epizy.com/bibliography_entry_format.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/51974554557.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/kugekiwulezujupedurisimuj.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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5188 bytes
SHA-256: 93230ad7560b314db95ed8a2d1494ef7290a817b371be00a1bb30d0c0cc4b40f
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 11276 bytes
SHA-256: 6ecb60a6c382599815c3bae6429c812d1648eeea98f2d18bd6b9ddb179e3e1a2

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