Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f678781f606f28…

MALICIOUS

PDF

58.1 KB Created: 2020-11-09 13:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bca724a50d333c704baeb1589b59e560 SHA-1: e8e6c2929b9875c6c694b651ce780f4c3ffb99c3 SHA-256: b4f678781f606f28523df75df17aeb7d8178d4467d15d092a5dde4d2871e39b2
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds a URL, https://traffset.ru/123?keyword=penndot+drivers+license+center+altoona+pa, which is likely used to download a second-stage payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://traffset.ru/123?keyword=penndot+drivers+license+center+altoona+pa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5f94674526863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f875a4f2a2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5f8c280f25225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f9bd6ec55b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f8ffebee2820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5fa5b02d91163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fa4c7fc4584d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8b78e38bf99.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/14acde03-8033-47d9-8206-7740dc253fa9/relibomovasatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f9ddf1-e248-4464-a955-5a772573b849/diagram_of_endocrine_system_glands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cd9fa1-779d-427b-ae34-6e965c6388ff/65305864759.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/dr_twu_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61448d12-beec-4b98-a3d6-005cbd672df1/33903541806.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_off0000a29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA29F 5128 bytes
SHA-256: e86c2b80513e1ed9c11db34ac0a0f69a3834b2f4bd40eed0d61ec330d112aac7
font_01_sfnt_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 11372 bytes
SHA-256: d20a8d6d496fa526b44198ed8b953747a70eeb9702cb9f03a84f409b38936fb3