Malicious PDF — malware analysis report

Static analysis result for SHA-256 64be7a26faf45e48…

MALICIOUS

PDF

67.0 KB Created: 2020-12-02 17:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1021527f39f1e54346760ceede299734 SHA-1: 1ad839c347adebf4d65971f091642c690f465195 SHA-256: 64be7a26faf45e48747db64d9ee4cdf4196c754affce219b06e56596fc548849
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=printable+comprehension+worksheets+for+year+3 PDF link annotation
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/67e348.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/4ce065df.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/ed6db0cb-504c-4412-813e-d1f7fa0fd906/48191487647.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/list_of_tropical_birds_photos_with_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72341fa9-f0de-448c-a7a2-2d564833278f/medical_billing_and_coding_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9e3bda9c57a97be47bf/t/5fc171d04f98375720161a9f/1606513106801/34735133773.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56a0368612547ed7c4422/t/5fc74c6bc953717e09d6875a/1606896750474/jamman_looper_xt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06ef3116eb00e3c49974f/t/5fc1c6a8e18c5c478e3d76a7/1606534824969/moxegonenibudezaxezomiso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6483f8cdb769c6dae22e/1606378628915/daisuke_persona_4.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/70975412935.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2af36df132613bbc92a03/t/5fc4dda31972c46e3c360add/1606737316423/compare_and_contrast_esl_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6051bc-1b3e-4fda-a0b0-fcb6a0ec8cfd/lg_sj4_review.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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 5820 bytes
SHA-256: f8e0c9445e6259de357dc364c33d5a1d6b706b9e6b2ad2efd1321b7ec252ec9c
font_01_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10504 bytes
SHA-256: 96f12e28acda399fdeb4691a6d69cc7966480b44537b67570194c7d9293523af

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