Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2431c9f66e7bef1…

MALICIOUS

PDF

71.4 KB Created: 2021-03-05 03:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a6a5de973659a3aaa07748c9e7433df SHA-1: ac1dd08d5a42c0ecebdf216d23c3eb9a8f3bba09 SHA-256: b2431c9f66e7bef1ec35b4cbc2bb059c733743a25a2ab6f0fe0fd12769e75631
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=convertir+de+mm2+a+pulgadas2 PDF link annotation
    • http://fakixigulidol.mywebcommunity.org/96571981050.pdfIn PDF document text
    • http://casser.xyz/72149654475jlvhq.pdfIn PDF document text
    • http://hookup157.online/80746697347b0fdg.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/10008921348.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/karetogadotirib-pinizalibiz.pdfIn PDF document text
    • http://psychologyrelax.xyz/felewanejivabalolubumexl7zym.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/gekexojom.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/xekedukulogulijenedabitik.pdfIn PDF document text
    • http://buloshnaya.site/wevafudazarijamitodipsv0yn.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/dexed_litufaned_bigegawimipiwa.pdfIn PDF document text
    • http://xozonline.ru/tanofatuvozevaxoteaiuk.pdfIn PDF document text
    • https://jujopikin.weebly.com/uploads/1/3/4/2/134265816/bapepizitemef.pdfIn PDF document text
    • http://dizewut.22web.org/organizational_chart_template_powerpoint_2007.pdfIn PDF document text
    • http://lozelenirulotu.22web.org/evaluation_sheet_for_presentation_skills.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/gajudoloritiwuvimex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwuwijagabote.myartsonline.com/problem_solving_exercises_for_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/endocrine_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/15548885078.pdfIn PDF document text
    • http://febefijawifuja.rf.gd/fuxalebelewovokulazope.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/22462134589.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/aashiqui_2_audio_songs_pagalworld_mp4.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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 5376 bytes
SHA-256: c4f16b2de58b849c3c8e8cbfb5b6aa4fb7c4809cc5929b69878cba42c6052af7
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11092 bytes
SHA-256: 8b63dc8be64302c8c6fcf196bd60c8d2b40a8ad58fb8c6408506c4d76cfbebdd

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