Malicious PDF — malware analysis report

Static analysis result for SHA-256 271ad286a8b69aa2…

MALICIOUS

PDF

69.5 KB Created: 2020-12-24 05:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 20d38b55ba4169567bb77d63614d1dcc SHA-1: 6d2d120aedcb987bd5d6b3f6f62c16ae4ab20df8 SHA-256: 271ad286a8b69aa2bf14fc43be41177f9d8b667746bd7f38cc7e9f63025afb48
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-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://trafficel.ru/123?utm_term=the+scarlet+letter+multiple+choice+questions+answers PDF link annotation
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/welobazokomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fd93b782b42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5fdbfe9b41558.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/csgihby/best_hop_step_dunk_animation_2k20.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/geifihx/39964256049.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/e7f808a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f9075f3dce5c.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/13555bae-ca6f-4ebf-9711-0e0851351e03/29089922298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5604410-a89e-4e42-bedb-7f2af3c44f1e/hz_sound_meter_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c05aff-5817-443d-a217-982d85cc8606/dedinuxoxelinerufeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982a0e75-feb9-4a6b-94f6-57c34828ae86/11758369432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d11e4c0-e000-431d-b548-f56538acf3a6/fusatakuxuwepevirapunexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb2f8e7-875d-4acc-9bbf-eaeb16158626/zarawekoreta.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 5340 bytes
SHA-256: 2fb14c466f33dcf7ca00bc5bf6baa23a627752edcfab7c916d0093fcc14b7061
font_01_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 9976 bytes
SHA-256: a9a7d89d6f8b20a59a7f9e61b6e64b3478996bebc8c9e80f6ae973bdcf3fc025

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