Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03edf9b2ca1793e…

MALICIOUS

PDF

75.1 KB Created: 2020-12-25 00:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b3cdcb1414306ff23c4638d5e108cf2d SHA-1: 70067f2d8ec9169f27098ebb6e94d558371c5f50 SHA-256: a03edf9b2ca1793e59c4458028afc8ba642959b5392668133e67bae877099f09
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafficel.ru/aws?utm_term=formal+commands+in+spanish+worksheet'. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=formal+commands+in+spanish+worksheet PDF link annotation
    • https://cdn.sqhk.co/fegujajox/gdaiaij/nisimigin.pdfIn PDF document text
    • https://vivifaxokuz.weebly.com/uploads/1/3/4/5/134511129/7390272.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/7807825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fb00f4e6ac02.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/478c6c75-3be6-4582-8a41-4d8562e93246/algoritmo_cubo_rubik_3x3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefea5f5-66e7-4f51-9a37-486bf13eaed9/constitution_self_test_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930102e7-aad1-4549-b60d-1ab425f4e9b2/fl_studio_mastering_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8dc462c-3608-496d-b4cd-b43f6e3fca41/sisterhood_everlasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7283ba-d196-4476-8b9a-3b87b9e1789a/72593121210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cc8a18-83cc-417a-983c-8a4c9e708459/naafa_convention_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c4a9c8-e573-4725-8432-a0f1d02636b0/biology_chapter_15_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7abfe49-e476-4964-9f51-7beb3b2ccf02/pals_cardiogenic_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0e9492-2ba6-4ae8-b51c-f2df73b1338e/dsp_first_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad1f756-6dd9-4a53-9cec-1330add49d80/tefid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ee7651-4c73-4284-9b00-1d661e23a03b/92281714188.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5424 bytes
SHA-256: abad1fa155adf8bbbd6425e0f891903d0a22e41b49d2d8f7153d6e1bfa53e80b
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 11900 bytes
SHA-256: 03a045f0eef9c988108459a7f527d323bd5993588b1b9e722f18d06777e60277

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