Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c43c40f7982aa22…

MALICIOUS

PDF

72.1 KB Created: 2020-12-17 05:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 122aeba3859d0aa5082217cfd22b2aa1 SHA-1: 2a3eefd0084729080e529e3e96d1e431bc708f77 SHA-256: 8c43c40f7982aa225c657f5023bde2e7bb9a67b491b5c4ef373b187f73a066f4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into performing an action. An external URI was also extracted, suggesting a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://trafficel.ru/strik?utm_term=lucky+patcher+apk+latest+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fcab8d36a04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5f9fb16fe1dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fb52da88dadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f88fc30afd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd1d115c42fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f88f5786c0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fd98a1eed421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fcc8dc8d235d37878bfecb6/1607241161026/global_sport_event_horses_ltd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4654da0a-3d7c-4406-92eb-3e1191f7d9bb/1158314681.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/jamededenogotowi.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 5188 bytes
SHA-256: 930520e509920dbbb55a1705cf74e371dcd3911181337bc121c5133f8962e23e
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10956 bytes
SHA-256: c2eacff160df8f21da1e6f50c4246344d52510a29ab0f3eba3db1bd1b249277f