Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5ddd272ea10094…

MALICIOUS

PDF

74.8 KB Created: 2021-05-26 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fdb5a4107382ac74feffb39b5ac4b39 SHA-1: 23e18d68bf50ad4c51d282565b03c5808b316f84 SHA-256: 9d5ddd272ea10094f533cf5b64ee93821df7b3f8c8fd65bc783cf03e4062a3eb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or traffic generation scheme. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=types+of+nouns+worksheet+for+class+5
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fd1596af19a1.pdf
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4f80c28c1.pdf
    • https://redewude.weebly.com/uploads/1/3/1/3/131379671/vufuvopizojuzemowej.pdf
    • https://cdn-cms.f-static.net/uploads/4425913/normal_602ba2591d98c.pdf
    • https://cdn-cms.f-static.net/uploads/4380068/normal_600df213a0b8e.pdf
    • https://buvosaxemapo.weebly.com/uploads/1/3/1/4/131437370/a1f4884ddcc4628.pdf
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5fe114359d04e.pdf
    • https://cdn-cms.f-static.net/uploads/4473056/normal_606e1ca7cbab0.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_606614b002c90.pdf
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/2887543.pdf
    • https://cdn-cms.f-static.net/uploads/4416923/normal_606a1135b7fd2.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_600a027f424cd.pdf
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/pusekesowo-relexez-rivefa-vosobifobe.pdf
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5fef36528521d.pdf
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/4470178.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6044759988708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cd01f445-7441-4c25-9d2f-79e4d03ccb3b/system_engineering_process_usually_begin_with.pdf
    • https://uploads.strikinglycdn.com/files/fe0df82c-97d6-4fcf-83fb-2087a908d4f0/38251477543.pdf
    • https://uploads.strikinglycdn.com/files/db2d23d6-0259-48a7-b16b-dc68db5d957e/dutigifuverofov.pdf
    • https://uploads.strikinglycdn.com/files/cadb5a8a-9c26-45bd-8a47-229761b6823a/how_to_progress_space_engineers.pdf
    • https://uploads.strikinglycdn.com/files/b539b5cb-16ab-49c6-9ddf-f223ee561994/4281509861.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67e.bin
28004c832129d9b1a65f8b58cb318c79e227a3b73f1df94c2069ad857404db32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 5436 bytes
font_01_sfnt_off0000f91b.bin
0e51d716421ab105803f64e10a42af276642a8e6d2c2472b6e7952aa2b4f92f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 10808 bytes

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