Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9ecbfde97dc440…

MALICIOUS

PDF

68.7 KB Created: 2020-12-25 19:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b36a92debc1899acf1795a247d85b3dd SHA-1: e7f3e11c0fb4d9f4338bfd925f7672d7c6adf641 SHA-256: ad9ecbfde97dc4400c4688089bc8cb66f29ff5fd9f023614d72002a13d0998aa
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 heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is disguised as a download for an English grammar workbook, suggesting a phishing or social engineering lure.

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
  • 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://ggtraff.ru/123?utm_term=basic+english+grammar+workbook+b+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5fb02d2b63ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419192/normal_5fe424b98d439.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/juzalizuvar/buwofedavilisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b81042-3dda-42b3-98f6-47f0d7a59745/mortal_kombat_trilogy_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c9b574-6c86-4508-afc9-1c0a5cd1989c/sepem.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/pixel_launcher_aosp_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/app_store_free_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65aa5fc-9f98-4667-a4d4-7271e32dfbfb/wunewate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e818f66d-5bbf-463c-b469-72f9503f4cf4/how_to_use_reaper_synth_destiny_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/29483284106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4266a9-33c1-426a-8ee4-3d93c0db5eb4/13233007857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d899cc4-a414-4e86-9dc3-63c3c7b753c6/29966047898.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fanaxibufom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af36d962-9313-4d06-968e-94ce86c796d3/aviator_avw7770g59_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44042fb-13f3-4a91-b367-2475c2b0bf9a/marvel_trading_cards_1994_price_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/zagudeketafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e55b74-4f87-4218-9360-04ddee4683e7/mini_basketball_court_dimensions_in_meters.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_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 5916 bytes
SHA-256: 4d56d049e4a6878f8d508c49d2e9bdeaa39f808796483a8062d4406beaa337b7
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 10512 bytes
SHA-256: 04915f6360f38d0a0b24b44e5f32979c81de497155e383a47a4a691a445d8a21