Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b82e9801901a8e…

MALICIOUS

PDF

66.2 KB Created: 2020-11-19 05:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2357485a581b2dba31e45f75d5742b87 SHA-1: b26eaf006a2513f68a85e5c8b32d5f13b5c80a09 SHA-256: 42b82e9801901a8ed53a9b96b1662cc3a5075970ca085b577129fd626ab03ef7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting an SEO link farm or a distribution point for malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'trafftec.ru', are suspicious and likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=tokyo+mew+mew+ichigo+and+ryou+lemon+fanfiction PDF link annotation
    • https://fidinavaxevipew.weebly.com/uploads/1/3/4/8/134876378/samolowipapuwivi.pdfIn PDF document text
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/mutidamewev.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/058054e7-2de5-48cd-b6da-6911af5dcaf0/80563505409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c6398d-1802-42d7-ad63-979808ce1e6f/sociologia_da_educao.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/tilikalomoxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e195f7-6406-45de-ab2c-5d41c1456aa6/buwaweludapiwidusetiweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bc18bb-223b-4b8a-bf09-06ba5db2ff79/peduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bf0186-0857-4690-a365-bb513540a7d7/tikadirix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60eee140-4eb4-4374-bca3-f2482d7c0bb9/complete_calvin_and_hobbes_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/11826961798.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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 5464 bytes
SHA-256: a8b43de97e53d69f5c8d8465f1f5dce26d35379394fe3bb5407a5231d97db4b9
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 10848 bytes
SHA-256: fc5dd6a6c528a6ba4e07cb5bc0fe2836bc92dd1ed984dba1e3d822b7cc7da1f3