Malicious PDF — malware analysis report

Static analysis result for SHA-256 c502c091d7777748…

MALICIOUS

PDF

42.7 KB Created: 2020-11-05 22:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ef3e95cc7b99c69b675c7906e95046b8 SHA-1: 26112e595f6fe1b272b6baeba78ce95c13cc6d3c SHA-256: c502c091d77777486012ea0b0ac3e8d6e7a51e6b241fe65b01bccf9c155d04d6
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/123?keyword=homeostasis+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f9cf005c4a54.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/rukoj.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/bf7723a3-d729-45f6-ac79-da420df71a3f/mr_pine_s_purple_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0220a5ba-e747-4c89-9671-693a14c48ea8/32570961942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5906aed6-2b0b-4db0-9412-afe1511dc0b7/vampyre_magick_father_sebastiaan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eae052e-75da-4436-abd9-231352840aa8/96829164633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45792ffd-ae0e-49d6-b879-456feccec433/6777490467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3a05b8-5074-47be-a61f-658d8f4ea894/3376847708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ea2429-0d04-4a5b-8907-bfb1890e8e00/fujuvubelalejum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb82d77-46f4-473f-b986-fc74ad50ad6f/5e_xanathar_s_guide_to_everything_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba6e409-d256-48ee-a596-9fe7ee48416f/86262292736.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_off0000689c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689C 5080 bytes
SHA-256: 647883e9ca1ea8a5d228e9e00aa49f1c3dfe2638f62ae1081715a08555f0f910
font_01_sfnt_off000079db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DB 10680 bytes
SHA-256: fa33133960a23bbdf86e34d0f0acdcd21e214feec9a950b0978ec768900146c3