Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc101d81ef76ab9…

MALICIOUS

PDF

73.1 KB Created: 2021-06-01 06:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 659ef476c71f0a2d4d08e36af41e9bd9 SHA-1: dd93beff47dd747396c1693511c50ca006eeb211 SHA-256: 8cc101d81ef76ab957807b0cc65d1fade6fb51699aa12ca7cca3393adab4d127
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. One of the primary external URLs, https://ketchas.ru/pbw?utm_term=causative+verb+exercises+pdf, is flagged as suspicious. ClamAV also detected this file as Pdf.Phishing.Trojan, indicating malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=causative+verb+exercises+pdf PDF link annotation
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/b462dfbf0cfbee.pdfIn PDF document text
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/a123e8c8ffa37cc.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lojam.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/f7fa196b-aa07-4e89-b13b-134b5f5413e1/24557005651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef9fb74-7851-4702-8bbc-3edb93afec5a/15999982554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ab0120-4a7d-4122-9e59-7e63b620b502/walter_benjamin_the_storyteller_reflections_on_the_works_of_nikolai_leskov.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144443433/49677230683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa40793c-c63b-44c7-ae17-69250d6d0af0/catia_v5_weld_design_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c3078f-a2fd-4d63-aa3c-049a8c40af8e/nazijiwinizolutumubor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5fde59-d3f0-4e7f-97a8-d1f4eecdd49b/jogugojuwiwuzusijeropobev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753bfa0e-bb3b-46bf-8b41-bdd7beb08403/jumifuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51656948-faf7-4528-a251-fa5df1b20978/81734616600.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144419874/17168598790.pdfIn PDF document text
    • http://finebov.pbworks.com/f/fasitubusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de983edb-5def-401d-ac16-7e4b5467249e/how_do_you_reset_a_first_alert_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4b5eb5-b760-4a74-a9ad-d9176dc55b71/how_to_be_a_spanish_medical_interpreter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1341c6ad-3b3c-4d4e-a3d0-ec619336e69b/lobepixotaxiwumogovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97852a1b-87ad-470d-8267-4f20da6f6127/apple_support_user_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad2b19f-842a-467b-b6e7-c17494ea5eea/common_types_of_electrical_wiring_used_in_homes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd4521d-44e5-4f95-8915-3b93dda7032e/65571636413.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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5288 bytes
SHA-256: 5ee691e2b475121ddec639a9d8d894e1ed8b6773927c09d3786a4644e65bf0a5
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10636 bytes
SHA-256: d573df50fd0c68afa3be0e2d0c4f8ac5e46bc36d665371569f892c36deaa1901

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