Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c46f57cc38bace…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 03:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2727b0b1d9926c643486cba91aa51a5e SHA-1: 17a71985883d9cd96c971a23f962bc8b0ef02cc8 SHA-256: 67c46f57cc38baceedc4974d927158cb38021134d9897582042da6aef999ada5
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The document body, though heavily obfuscated, suggests a lure related to search queries. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=imperialism+in+africa+mini-q+document+f+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492257/normal_600147495759b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_602ac2de3f8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_602f8005f04bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebe334e055.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/20927800731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_600de14cb5a0c.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/51582474695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600b1d67f197e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_5ffcb8fb93c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_60409d58743ca.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/4675736228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ff0dbbd93994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_602df28e88512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimuwixoxuwe.epizy.com/43831044122.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/meditation_music_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/xidobifarutarusejotefuri.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/lowuridovif.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/sesorabinakut.pdfIn PDF document text
    • http://tudutov.rf.gd/jnc_hypertension_guidelines_2018.pdfIn PDF document text
    • http://naremijex.epizy.com/gudovamujetiwekijef.pdfIn PDF document text
    • http://gipomafusabakix.rf.gd/multiple_if_statements_in_google_spreadsheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/posejoperabi.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/antibiotic_stewardship_program_guidelines.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5488 bytes
SHA-256: 559cff80f564b6b1e019b6b0916f27e1ba153fcb58e157e5486e22ee5e4174e1
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 11204 bytes
SHA-256: 48f22c103ee1b464c4864b03e6d8a6b1813c23fcb532cd8ecb26f547e69dda70

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