Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22763870db8491f…

MALICIOUS

PDF

148.8 KB Created: 2021-02-19 22:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c703d4e6f0a02ecd7b49318cfa978560 SHA-1: ff9390857590be6caa598199f3f9e4eaa3b49658 SHA-256: c22763870db8491f9e2d00f88c253c2370817f054548019fbab9adef612eca4b
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, likely for phishing purposes. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=can+a+person+sense+when+something+is+wrong PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5fefc26a303bd.pdfIn PDF document text
    • http://lightstart.xyz/a_pair_of_tickets_joy_luck_clubafz1k.pdfIn PDF document text
    • http://prechambre.xyz/airtel_tv_app_tamil_apkyqqi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_5fd19e137327b.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/4xhahcu/15140127684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5fca4c534784b.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/gfthjgh/xomofuxag.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/varoximu/display_battery_percentage_android_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/oropharynx_contouring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/fugizawimazaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/851016668.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/xowutexonoze.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/bujevodikotenamakox.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F656 5196 bytes
SHA-256: 512948238834bdf12fe6d0cf35b77b4462a0fdd8d17177c1f16c1e453ee82e7a
font_01_sfnt_off000207e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207E8 12188 bytes
SHA-256: 59f1212a33e404ea0857560250ffbc9500d46c4d1be956efe8ebac0da316a06b
font_02_sfnt_off00023051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23051 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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