Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d198c3c8f1c835e…

MALICIOUS

PDF

75.4 KB Created: 2021-05-08 03:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aef6487e8cee5e78e5a7c36f8f8b3aa0 SHA-1: 9d2905d0d957a7e4639d98bb6180cf5b428e8245 SHA-256: 8d198c3c8f1c835e6e5dd35f23a051c4bf0280d80a4758e81ee3a08e53a3c683
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=introduction+to+mathematical+programming+4th+edition+pdf PDF link annotation
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/7843814.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/1896253.pdfIn PDF document text
    • https://vaxamapex.weebly.com/uploads/1/3/4/0/134017084/vixozif-mamulilex.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/nemetuteg_xawezeve.pdfIn PDF document text
    • http://kemedejovon.getenjoyment.net/el_poder_de_cambiarlo_todo_libro_gratis.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/86732768787.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/d7fea58.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/tosurubevuja.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/5308930.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/ponego.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/ayurvedic_food_book.pdfIn PDF document text
    • http://butojaxutaj.22web.org/how_to_interpret_data_in_statistics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mufifofoge.epizy.com/veregikopel.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/violin_sheet_music_amarillo_by_morning.pdfIn PDF document text
    • http://xevaxujexodo.epizy.com/2013_dodge_avenger_2.4_thermostat_replacement.pdfIn PDF document text
    • http://wixevudu.epizy.com/endometrial_hyperplasia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/fofiletekegiv.pdfIn PDF document text
    • http://junadalolupes.epizy.com/hysterectomy_complications.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/backuptrans_android_whatsapp_transfer_keygen.pdfIn PDF document text
    • http://nufesuku.rf.gd/senupe.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/dalaniwumulifomuvipegajo.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/avast_antivirus_free_xp_2006.pdfIn PDF document text
    • http://fonumelipo.rf.gd/ivy_global_psat_answers.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5416 bytes
SHA-256: 97b108ec92d36a77a5de7435605c6c95d41605322ee93eb7238cfd48d8cb0d0f
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 11312 bytes
SHA-256: 7072e45f1c90db8065b63b3cf00312d7f0a6b45b940cc8f32ebd4118e0be98dc

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