Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c7d09ec3747322…

MALICIOUS

PDF

78.1 KB Created: 2021-03-28 16:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14bd7e9d61d4c69650d3fb226053a4a2 SHA-1: d5c9729c1a48f70849eda00ea2dfb779c136e33a SHA-256: 89c7d09ec3747322ebc2d1ff4981573a6dffe621431b75c9c148651cfc5e4d4a
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 disguised as search results for educational materials. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful websites.

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://kuzutuzo.ru/wix?keyword=piano+adventures+level+1+2nd+edition+pdf
    • https://static.s123-cdn-static.com/uploads/4416923/normal_600167e8371ef.pdf
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/9fa08187.pdf
    • https://static.s123-cdn-static.com/uploads/4379732/normal_5ffba7df72bf5.pdf
    • http://zewikeb.iblogger.org/48337261355.pdf
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6056ac340133a.pdf
    • https://ruginimurixibiz.weebly.com/uploads/1/3/1/6/131606491/besibojusodinew-lurusave-rabibejov-vavaziz.pdf
    • https://buvosaxemapo.weebly.com/uploads/1/3/1/4/131437370/mokavufatovoxoxeli.pdf
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fcf4a79af800.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/bofumileriwez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_935d52c81111485ca3f66f97f150963f.pdf?index=true
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_9a9851c764364645b1142338bebc646a.pdf?index=true
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_8ae85486a0de4e678d80eb392923e513.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eee3a6ca-60b2-4b7c-a66d-374c9127040f/prince_of_thorns.pdf
    • https://uploads.strikinglycdn.com/files/f678d261-6de3-45dd-84bc-da47ff2fe262/37202973380.pdf
    • http://fopagozijudiri.epizy.com/dinuginazatozefu.pdf
    • https://uploads.strikinglycdn.com/files/fe8fb8f7-eea5-47b2-9d56-ea92266ed1eb/nakokubujorajalizekeris.pdf
    • http://nurujoxarim.epizy.com/thoughts_are_things_bob_proctor.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_61c65ad9bf8b40c59f6f2f0194b3e7e0.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_2a6d244f0d814591947f8bbaeea3b44c.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31d.bin
94d1ada59b74732013b2238ec25c93a55d9b9d679399d275a5dbc7b94f62ca37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5160 bytes
font_01_sfnt_off0000f4be.bin
a5f7127fa855f6d39e794fabb4de30f29d24137013a06fb48f5b0ef48d2c80d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 11336 bytes
font_02_sfnt_off00011b43.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 4324 bytes

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