Malicious PDF — malware analysis report

Static analysis result for SHA-256 965aee3ec5c7989c…

MALICIOUS

PDF

69.2 KB Created: 2021-03-06 06:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f4dfb5eb8f770dcc3a2a4492f4fa3b3 SHA-1: 242a7f8554f02ec1d20b736cb6c1e8c4608cc902 SHA-256: 965aee3ec5c7989c37a031fdcce24b7556c19e529b8bec91b011d888d89709b6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=cahsee+practice+test+math+answer+keys PDF link annotation
    • http://dodemul.mygamesonline.org/how_does_reactive_oxygen_species_damage_dna.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/azar_old_version_3._0._4_apkjdoyh.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/cardiopulmonary_rehabilitation_program_guidelines.pdfIn PDF document text
    • http://interplast.ru/kifunajaxujogirikafovamoz8cxau.pdfIn PDF document text
    • http://ig-objectionform.com/rudedisokameviwobutavq2lj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_a10f2833e2a34a5bb3f192960e0ac90d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a26f70-6a9a-4f82-b8de-e6e60795a214/33140788825.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/glossary_of_strategic_management_terms.pdfIn PDF document text
    • http://pebujenutifovo.rf.gd/pastel_yellow_formal_dress.pdfIn PDF document text
    • http://jutatodimat.epizy.com/tenejusekiji.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_5fb19b34888145b199310520b44f3f7a.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/78327307454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15660a89-d2ea-4e08-a5a3-641e7e252379/wexarol.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/auto_responder_for_whatsapp_pro_apk_2019.pdfIn PDF document text
    • http://bowudizukeb.epizy.com/dujawifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31a38b1-fe72-4691-8258-4f75341e4d5e/pumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/sony_bravia_android_tv_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/diablo_trinity_t1000_update.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/adobe_flash_player_11._2_android_apk.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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 5304 bytes
SHA-256: 7a445ea386b6c52afc4c6e7d2ac2f89af5e187d2e890eed7ab45c82f753730e0
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 9788 bytes
SHA-256: 6a167133276f7601131bc0385e6102287087e5d8d53b7c4439c2870318f236b5

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