Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce05ee35ffacaec0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 16:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 950c738e9c5abdc0be6c5d756911cb41 SHA-1: d59dc3ac9b5f5efbf2693b8349cb828096cd7a28 SHA-256: ce05ee35ffacaec0c80db27f4ad54c4b56dcdda8636b5ac1ca2a187b4bb173e1
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL identified as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, suggests a lure related to 'Personal conduct policy definition'. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for malicious PDF exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=personal+conduct+policy+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490722/normal_604b8d0c0d3b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fcb062d99c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_60152a3c58270.pdfIn PDF document text
    • http://dazomasuw.22web.org/kdigo_guidelines_ckd_2012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_60230e5beb530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6057f9d06a49c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_6006bbd75100c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5ff2ba79c53b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_602e78b652976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5febe9215d327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_600a589e82579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_5fefc1983dda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_60542cd55a356.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/a5c1e485-c0e8-47dc-9a5e-f158841d6b5a/40835842838.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_46e1311f05d14b63b1e6cda32332d6ec.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_e007d9de35ee4a9a81aaa95ec31f26ec.pdf?index=trueIn PDF document text
    • http://xukajipovaru.epizy.com/barbie_as_rapunzel_cartoon_free.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_08a5cf94e08f4a0ea19ff1c798a41b36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5e95c4-9287-4bdb-9c40-ab99238400d1/52390944089.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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5252 bytes
SHA-256: 3c9ac91448d13fdde4d9efa724abf248e058f87d29ab207630a6ac39cfe3fa52
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10408 bytes
SHA-256: e7b9c83fa55351f722318ba37ab37960afea6d1a405b2a9cf76028726dd7cf29

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