Malicious PDF — malware analysis report

Static analysis result for SHA-256 680832438f061b38…

MALICIOUS

PDF

76.6 KB Created: 2021-03-18 05:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ff414ae597a32d5b5dd588843c5c14be SHA-1: 2499edb9e993bbb146be45eee41b141daa923d35 SHA-256: 680832438f061b38862e37e7aef85f9ccf80da95bb40e3da4b3e2d494282c978
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with the phrase 'curl+up+like+a+ball' further supports the idea of user interaction leading to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/strik?utm_term=dark+souls+curl+up+like+a+ball PDF link annotation
    • https://cdn.sqhk.co/rebabafa/QpgiLoh/resegazofezon.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc949882c918.pdfIn PDF document text
    • http://topcreditreport.info/kutidefaxo736bm.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/gOiigjb/genius_scan_scanner_review.pdfIn PDF document text
    • http://voztrans.ru/doxofepenedupajijawghw17.pdfIn PDF document text
    • http://thefortykuti.com/how_to_program_a_viper_car_alarm_remote1fpgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_603e39abdd8dc.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/what_is_a_caliper_used_for_brainly.pdfIn PDF document text
    • http://bt-management.website/97679405021ocffy.pdfIn PDF document text
    • http://creditinquiry.info/microsoft_office_2010_not_working_on_windows_7_64_bitvo0nj.pdfIn PDF document text
    • http://penageli.getenjoyment.net/63204758289.pdfIn PDF document text
    • http://tramlaweq.online/174794448934bma1.pdfIn PDF document text
    • http://sportplays.ru/air_cooled_chiller_maintenancez67tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5ff28cf314b94.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/hF9shcP/hobby_lobby_near_me_hours.pdfIn PDF document text
    • http://sosed.market/jebapurexafinikiztcnbm.pdfIn PDF document text
    • http://igcopyrightclient.com/doxonarafalamamowew0y5lv.pdfIn PDF document text
    • http://yourlivehelp.com/zatezilogovmhzs3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 5132 bytes
SHA-256: 319915271f7477d96e19a3e5cd1eb8f16134a34b97ba22fa0a06973a4e25ef74
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10924 bytes
SHA-256: 76716f6686ea98ba348fea85d4195e34e5205c18992a9466b234432511f51ad6

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