Malicious PDF — malware analysis report

Static analysis result for SHA-256 759f8b4b60dac319…

MALICIOUS

PDF

40.5 KB Created: 2020-11-06 10:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 37f6183749484fd177c443c54849703c SHA-1: d9a7811e7e2c88c844e3b64bd4a32b717c828655 SHA-256: 759f8b4b60dac319d3487008811deefe17b2472f0d8091bb48094cbd03ab02f7
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 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/strik?keyword=jody+baby+boy+quotes PDF link annotation
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/c39738.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/7730302.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/6f309f8f-795c-4825-95c6-b948250b2a6d/42117703502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37fe6fa-58de-4a32-b37f-4e44918f2b28/messi_height_growth.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/pdf_to_word_online_free_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e8be78-e272-4f96-9351-93d0c1dba21c/5508507696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be036f51-c2bd-456e-91fb-f5b724e13336/d_i_v_tr_nm_s_khung_xe_attila_el.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57be2ad3-324f-4207-91dd-e823e5712155/tawubusimajexakim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5476a5e-be31-44e4-9700-573d76c7147b/factory_setting_ipod_classic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026e8081-5bf3-4186-87d7-a7f8b302cd4c/comprension_lectora_4_primaria_anaya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe0c7b4-a4d2-48f5-b604-88657690ee65/lupeletoti.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_off00006112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 5048 bytes
SHA-256: a913f5163ce44ffd9be2bbafc6264ae145cd254fc4df9a4cbdecbca428ae8f4c
font_01_sfnt_off00007256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7256 10584 bytes
SHA-256: 59b5004b525e7566fe0141f9cebf83547cbdac9f877b87a29e3b29d346c8399a