Malicious PDF — malware analysis report

Static analysis result for SHA-256 421718caf6a3f5c3…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 16:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 630c887b86c4711836746641bbbc7df3 SHA-1: bd36637b22260462bb21d1554dc783ae97d392ae SHA-256: 421718caf6a3f5c3a9c04d3be10e2ab4b05634574d8a17163f3b525db17799b1
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Ti nspire cx cas emulator online', likely a lure to entice users to click 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=ti+nspire+cx+cas+emulator+online In PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/tonerijipadogiwuz.pdfIn PDF document text
    • http://xuxelenoxuze.iblogger.org/62428857189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_6025978aafbac.pdfIn PDF document text
    • https://domirirezup.weebly.com/uploads/1/3/5/3/135382932/4734223.pdfIn PDF document text
    • http://imedo.ru/le_petit_nicolas_englishdc19q.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/kokojidedafixeozdij.pdfIn PDF document text
    • http://nuvuzujujafusu.22web.org/tamil_kalai_vanakkam_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_5fe818af0e2c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_6008c6794c346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinirujoki.epizy.com/jikim.pdfIn PDF document text
    • http://xivegujox.epizy.com/asset_under_management_balance_sheet.pdfIn PDF document text
    • http://fisowafoz.epizy.com/bicep_exercises_with_dumbbells.pdfIn PDF document text
    • http://rodujuvutadaxam.epizy.com/microsoft_excel_2016_skills_test_answer-_2018.pdfIn PDF document text
    • http://wabipoxagapez.rf.gd/google_admob_android_example.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/suddenly_seymour_sheet_music_piano.pdfIn PDF document text
    • http://nodezolejew.epizy.com/rapuxanafuwiwifegozep.pdfIn PDF document text
    • http://goseletew.epizy.com/free_bar_inventory_excel_template.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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 5096 bytes
SHA-256: c93818591c0f98dbdaab5d5585115310709721e579766e393c32e2c4a9f777e0
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10528 bytes
SHA-256: 995b6a7bd1387d07bb95a6f99f2d4fe86a93cf9951ab91d7ba9f11d83a7bb83f