Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f62c201ff2c865…

MALICIOUS

PDF

43.2 KB Created: 2020-11-08 02:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e3cf47d4f849314a7ecd73a5e3fb74dc SHA-1: 9571433fe499aa2a8c766ca6f6bedeac27dc20fc SHA-256: 16f62c201ff2c865a2f7c055f7368b11f4fcc38b07cf090b28455f71c98588f8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs hosted on Strikingly and WordPress, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://trafficel.ru/aws?keyword=world+history+chapter+15+review+answers', is embedded within the document body and appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=world+history+chapter+15+review+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d336421b-46dd-4bb0-8e08-ec205cc7dd6d/26301205343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16bda83-cd98-4f0e-955d-7e37d3948af9/kafeloxow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c904a8-6c7c-46a3-8df9-28166508318d/69325845827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe2f679-83de-4eaa-aa0d-2a6b983790ac/88686298021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1181708e-182d-4834-8f37-cea80e592380/66927685757.pdfIn PDF document text
    • https://xisevijako.files.wordpress.com/2020/11/cuentos_para_representar_en_obras_de_teatro.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/que_es_la_quimica_organica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cb82c4-b5ed-4265-b130-5133a3274d8b/torerases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b2cf60-97bb-4aa7-b154-a403b67f89de/how_to_change_ascended_weapon_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940e21ef-cd6d-4e45-94a1-1eb53e681c98/49259684324.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/modagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a685e078-1ba6-442a-a40c-e8f62f3c0fb8/sonny_ericson_cyber_shot.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/congolese_girl_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6f5c5b-5d77-465c-9459-e517a2cd0782/93826122336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bae9ad-e5ac-4077-bdbb-41f8e4f7fe2c/17963572391.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_off00006a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7B 5604 bytes
SHA-256: 08ec7719467b9b66a7f3e7b9aca0abe46a9e68705ca5135d307399fc48a9b6eb
font_01_sfnt_off00007db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB0 10112 bytes
SHA-256: 65cb26e3de5c6390b095bd2c811057c1bed9177b74ae7aec2950dce504432184

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