Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd50640df4e5a6…

MALICIOUS

PDF

86.0 KB Created: 2021-06-07 14:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5f4eca5fe84dc0bce52644a23eb92fe1 SHA-1: 2630180e0c79204e931a8ac67dfd0c6ebb81f86f SHA-256: c8dd50640df4e5a6da55191d06d85b34a9bcc3aedf45226469902e5ae8175912
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://laborke.ru/pbw?utm_term=interpreting+line+graphs+worksheet+high+school+pdf, which is likely used to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://laborke.ru/pbw?utm_term=interpreting+line+graphs+worksheet+high+school+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387232/normal_5ff1bb107c4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6009f6a77dde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_606d68033399d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_6043488b5fc90.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/7096730.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474470/normal_60b3e9fc08e57.pdfIn PDF document text
    • https://mitexasax.weebly.com/uploads/1/3/1/8/131857270/9860614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_6004741186c77.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369769/normal_60b5e09a3435e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_6035c93dd2fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_601a1bd36b065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_603810e376d30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23f9ba3-0bc0-430a-8783-d084e9d58ef4/how_to_get_a_drivers_license_in_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06448db-31a4-4133-a5bf-64c1330c6f5c/miracle_frp_tool_thunder_edition_v1_47_crack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cdd575-613c-4e0e-8600-b7a41d5eda9a/descargar_pokemon_blanco_2_emulador_ds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277fac52-70b8-4e27-bd19-305ea5e1306f/71955296949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01d36ab-d80c-455a-9f36-170a2e226977/how_to_ask_personal_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e87b22-f79d-4b82-a8b1-da2913091d14/52271765308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba22f923-631c-43de-a2ff-83f377f2a754/boy_scouts_of_america_store_salt_lake_city_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef5971a-e297-4a26-ae22-97dae84d5d0d/67667656779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9f3d67-18f0-4bc4-ad6a-601d3fc7597b/sims_4_update_november_2020_ps4.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_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 5512 bytes
SHA-256: eec3792631c86bae6aad361e31a5023fa3c64ee3e80c52b5463713c4c84a0e33
font_01_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 12296 bytes
SHA-256: 8c49f833a8bf72575f44eab7f345eeaf4919562a18c8a614922d73d6e3c4df03

Open this report in the interactive analyzer, or submit your own file for analysis.