Malicious PDF — malware analysis report

Static analysis result for SHA-256 99066f2035ca1681…

MALICIOUS

PDF

75.7 KB Created: 2021-04-19 19:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c8743964b8d39455ac8b7303dfd81513 SHA-1: 4e13c5eb24686cb67425f57cbdf93b6706dc304f SHA-256: 99066f2035ca16810c061793a3bb23fbc487dfe7c0648a24acdac0ad18d5902e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL `https://zajinet.ru/strik?utm_term=how+to+troubleshoot+compressor` suggests a phishing or social engineering lure, likely aiming to redirect the user to a compromised site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=how+to+troubleshoot+compressor PDF link annotation
    • http://vajesafosedepur.mywebcommunity.org/how_to_activate_pvr.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://sadovik.me/california_common_core_standards_language_arts_third_gradeqdzwz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_602e32adcf8b5.pdfIn PDF document text
    • http://meinekarten.best/persuade_inform_entertain_song77e1r.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/lolilekenogono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_606cd917681b1.pdfIn PDF document text
    • http://kigurumi.org/bloomberg_new_energy_outlook15qae.pdfIn PDF document text
    • http://timecodes.net/spanish_numbers_worksheet_answersh7udu.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/cassava_cultivation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_6041a33d59f29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e596647e-af07-4463-a3c3-3a209369066a/gifepakawigin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09e35ce-a3e0-489b-bc62-99224804b330/93597810617.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/wotaguw.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/70661157171.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/dark_souls_2_bosses_ranked_worst_to_best.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/autocad_cursor_command_box_missing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0b18aa-485b-40cf-8418-749a87e064c5/what_genre_is_miss_peregrines.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/chrome_plugin_android_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/48109750223.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/82569121733.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/sumib.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/ludufegu.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/fotenatu.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5156 bytes
SHA-256: 8ddca168b4383056eeca484a6c8335ea425fa580bc4acf3b5bee300fa2b68436
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10460 bytes
SHA-256: 9d9bbfc46af46fccf0068151fe5b50e3e42e7079ced525e7802bfe06d3c09d03

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