Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d57c7dec33168b…

MALICIOUS

PDF

75.4 KB Created: 2021-04-05 13:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4821ee19d64960e83f985fec21c40a5 SHA-1: bbf3f03490c31683ccda813ddbca5e72be802759 SHA-256: 95d57c7dec33168b142abc6c246996853d672746e49513ee5c19f142ef3e1f6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is 'https://gimoguvi.ru/award?keyword=celebrate+recovery+workbooks+pdf', which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=celebrate+recovery+workbooks+pdf
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6056ad852888f.pdf
    • http://femusawar.iblogger.org/phosgene_sds_sheet.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_606aab248a2d9.pdf
    • http://fegiroxopirez.sportsontheweb.net/cambridge_latin_course_unit_3.pdf
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fedb8c8c5654.pdf
    • https://cdn-cms.f-static.net/uploads/4425484/normal_60315a69be594.pdf
    • http://xixapewazawa.22web.org/gutopobijofom.pdf
    • http://gazajujana.mygamesonline.org/sumber_daya_manusia_indonesia.pdf
    • https://cdn-cms.f-static.net/uploads/4444638/normal_60171a65ea0e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc6789d3-67e9-4aca-aeaf-fcf020f641b6/how_to_write_a_personal_reflection.pdf
    • https://uploads.strikinglycdn.com/files/ff10dbbc-de49-4678-b0b0-56d29395219d/bitijubaxepuboduxazulajuf.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_83d91ea51b44492cadd1d4eecc40858a.pdf?index=true
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_73103016b5934903a42672d9c020fbd8.pdf?index=true
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_5a48b8b7529a4a099282eef8b39583f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76c12123-66d7-4c6f-a221-e75ae1f862a6/pedro_como_agua_para_chocolate_autor_y_nacionalidad.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_2a5a054c696c405f979e77b62d53824a.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_44d993e765984e5eba346f49260f3581.pdf?index=true
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_9d75393e67b548b5875b09d45f8563b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a95da23e-00cb-4762-bba2-28c6001cf3b7/how_to_pass_acs_organic_chemistry_exam.pdf
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_efb276548a774128b3552680976cd565.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e709.bin
ec2aea1f5adfaa59a9e4ca4332d43f65cc60849d61ecf78548f396bd1da8896e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5512 bytes
font_01_sfnt_off0000f9ec.bin
cbe2dcfd5c243cef45eb7e7bf8b2cb01112d58cb438640d9419f1633720254ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 11196 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.