Malicious PDF — malware analysis report

Static analysis result for SHA-256 5392ecb97f9cc4a9…

MALICIOUS

PDF

75.1 KB Created: 2021-04-06 19:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b5d354fcb83627596cb0c753a75cfd17 SHA-1: 9f7e9921232b5d39b29dec0a16b698553237bd24 SHA-256: 5392ecb97f9cc4a91c7489887b184a21e13aa784a7fd3e70a6201aee3ea51fbe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://soxebez.ru/strik, which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=how+to+remove+demi+permanent+brown+hair+dye PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60286ef35baf9.pdfIn PDF document text
    • http://sibamonowoli.22web.org/kaganapang_pansimuno_worksheets_grade_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_604d4a3cdc4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_605dcab83824d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_043a205894c0417f8b3c8e1e4efe99e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4475a36-d880-466e-9d97-509ceb9bd62d/what_skills_are_required_for_managers.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_4a3876b7da4144d2a3397c07e103477d.pdf?index=trueIn PDF document text
    • http://zunimesigo.rf.gd/argala_stotram_in_telugu_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1837ed-cf59-49b4-b23b-20de06deeeee/78354486736.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_5c55de64062746e5baa5f80b56bb81d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/60417827615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dfb703d-5a1b-44bd-8d2c-03e7bd0f9f1e/89637168314.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_faa334db6fe04c358a8a1d706b6c6dc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/animal_farm_vocabulary_worksheets.pdfIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_14ee3940e9be40908183cf6256fb9d94.pdf?index=trueIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_0da0db35ace2465296a5710a85b8cfce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29020d20-1ef6-46ca-9e18-1be25418170b/zuporawezifuduvafet.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_eef6f8d1d4cc4cd2b02004c80d862e11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7273d2ef-ceba-470f-9680-de2a47628d64/when_to_do_morning_pages.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/90608108834.pdfIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_b4ceffec3898418db080c59862e82369.pdf?index=trueIn 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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 5344 bytes
SHA-256: 2d1ed30ec86a86cc48f0a6a2a76d73e1032c88d858754aa7ceec671d946b4358
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10644 bytes
SHA-256: cd408b5d56400f59753f878d3e33d10379a20a12c5711a4403f114fecc5f8dc1