Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd73f0f6c61a4749…

MALICIOUS

PDF

76.8 KB Created: 2020-06-12 19:48:47 +00:00 Authoring application: Pdfcrowd.com v20180221.063 (via Skia/PDF) First seen: 2020-09-07
MD5: 3d9a3bd423305b312faf0f20d31697a1 SHA-1: 65e82589eb8e4c281be41691d7d5b63e894cafc8 SHA-256: fd73f0f6c61a4749c701fcc8aee2a71d10e80abc7de19436148cc3544efecbf8
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The file is identified as a malicious PDF dropper by ClamAV. A critical heuristic indicates the document presents a fake CAPTCHA, a common social engineering tactic to coerce users into executing malicious content. The presence of external URLs, including one redirecting to 'prankwerpk.com', suggests a delivery mechanism for further stages of an attack. The overall pattern points to a phishing or scam attempt leveraging a fake verification prompt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1246

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-9627933-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9627933-0
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://pdfcrowd.com/doc/api/?ref=pdf.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pdfcrowd.com/doc/api/?ref=pdf PDF link annotation
    • https://pdfcrowd.com/?ref=pdfIn PDF document text
    • https://pdfcrowd.com/doc/api/?ref=pdf)/TypeIn PDF document text
    • https://pdfcrowd.com/?ref=pdf)/TypeIn PDF document text
    • http://www.monotype.comMonotypeIn PDF document text
    • https://t.umblr.com/redirect?z=http%3A%2F%2Fprankwerpk.com%2F&t=ZDExYTgzOWU0NjZjZDQ5NWZkMmJkMjcwMWY2NDhjYjZhN2RkZTg2Ziw2ZTFkNjc3YzBmZDQ1NDMwY2M1ODU1N2RjOTUwMjYwODE3MDM1NDkxIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://www.monotype.com/html/mtname/ms_arial.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.htmlIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000029be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BE 36852 bytes
SHA-256: 33e9f8329c8aa8a8b6c09e87554c85306eec5445f78040dd8d6eee3a3b2b40a6

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