Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bef53defe19396…

MALICIOUS

PDF

70.4 KB Created: 2021-02-24 05:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e1f12b18cc0ed503426816a711d206cb SHA-1: db349498e41f2e8a5f7ceb22321f5771b023883d SHA-256: 83bef53defe19396620d8ab6ac3fa0489ad5c732620e6236a5ef4de5879c52a9
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 as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://leonvi.ru/strik?utm_term=duet+washer+code+f02', is directly embedded in the document's text. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content or phishing pages.

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://leonvi.ru/strik?utm_term=duet+washer+code+f02 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412905/normal_600f23b638f0c.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/d7aaab1ccb84.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/kefok-ketoxaken-xubitufazijum-pinivuxixuvepof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5ffe12c743640.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/gexexuribudalagerubo.pdfIn PDF document text
    • https://baduzasozem.weebly.com/uploads/1/3/1/4/131407439/01cba3603ba4.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/qjdijgh/71316432862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5ffacdff7ad25.pdfIn PDF document text
    • https://cdn.sqhk.co/lokatatape/Ygi2vM2/lifuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5fda93182f68b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366020/normal_5ff14b0145bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_600ecb5ebfaf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_6014eb3cd4884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/gevajobokaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/xasoleronoxejuloguxujose.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/6822316717.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/pofagofukapujibak.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/mavesobanukawoladakolaxis.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/what_is_the_purpose_of_grounded_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/nasugezibaf.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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 5444 bytes
SHA-256: 3773ff7f0d83c3808ffd4f003b04c3ce304d3f9e40b995e44454b8c898bcec2f
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10524 bytes
SHA-256: cac3c3bdc141d886339ceabf463bc6c89802af43f70fcab10f2e8fa7f256259d