Malicious PDF — malware analysis report

Static analysis result for SHA-256 85632d88c6b2dc0d…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 20:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1553b34d155003d16f792cb17a3e1a26 SHA-1: 9eb13c7e2e4000f6366a079ed363521cf349c4f0 SHA-256: 85632d88c6b2dc0d225506a8d24366723dac02f35cc54114610a5f9bf68c1097
154 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 S3 buckets and other domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8921

Heuristics 4

  • 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
  • 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://kuzutuzo.ru/award?keyword=food+and+beverage+menu+knowledge+pdf
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/fojebiwazod-gagivexawukuz.pdf
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/8140538.pdf
    • http://comp-arenda.site/junogupuxadap73ben.pdf
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/pakejivijosufavugut.pdf
    • http://gatofupimekow.mywebcommunity.org/venakani.pdf
    • http://fifamarketbot.com/fisher_price_swing_assemblymi65a.pdf
    • http://dotenipago.medianewsonline.com/jozevuvuvif.pdf
    • http://reduslim-italiaufficiale.site/ielts_writing_task_1_pie_chartrfysn.pdf
    • http://bozesedixek.mywebcommunity.org/difference_between_bookkeeping_and_accounting.pdf
    • http://malolufixanovas.sportsontheweb.net/cambridge_primary_checkpoint_past_papers_2020_maths.pdf
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/27cb757e917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wazagidonux/62801926316.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/what_does_number_808_mean_spiritually.pdf
    • https://s3.amazonaws.com/vuxirefare/99630736277.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/99478451918.pdf
    • https://s3.amazonaws.com/nerugiraxura/dibevemewurelaru.pdf
    • https://uploads.strikinglycdn.com/files/325f93d1-a662-4073-8150-454de68e783f/migoxunonigekurupiniz.pdf
    • https://s3.amazonaws.com/kuxuxemu/singer_heavy_duty_sewing_machine_bobbin_threading.pdf
    • https://s3.amazonaws.com/wulagisi/48318171863.pdf
    • https://s3.amazonaws.com/muvemasoxaji/adeste_fideles_piano_sheet_music.pdf
    • https://s3.amazonaws.com/bipepezuwed/material_safety_data_sheet_binder_cover.pdf
    • https://uploads.strikinglycdn.com/files/c085d14a-24f1-4ba7-b9de-51d33451de84/minn_kota_trolling_motor_parts_amazon.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ce.bin
ef6f93dea83b4190dc843b6383a21d927b95b45dc36fa8327198b8e8791257e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 5248 bytes
font_01_sfnt_off00010aa5.bin
816babd452c6bb3b87320963f554034b1d476692e942edbfe081b54fae4ff959
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10956 bytes
font_02_sfnt_off00013022.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 4324 bytes