Malicious PDF — malware analysis report

Static analysis result for SHA-256 7221a90f6667113c…

MALICIOUS

PDF

77.0 KB Created: 2021-02-24 00:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2123c8e4a89a1e833886ad44d45efa3a SHA-1: acd7aa6895b6e7968171acca56a55267781ed751 SHA-256: 7221a90f6667113c7e10d1ef1b7d1953c9153135d4f59261fba92db159cb166c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. Heuristics indicate it functions as a link farm, directing users to various suspicious URLs, some of which are associated with downloadable content or search result pages. The presence of 'curl_texturizergbd9w.pdf' in the document text suggests an attempt to disguise or facilitate the download of malicious content.

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://baarspo.ru/wb?keyword=vizio%20sb3821-c6%20subwoofer%20not%20working PDF link annotation
    • http://milanomoda-italy.site/76028368861vyczd.pdfIn PDF document text
    • http://golden-bridge.pro/how_to_use_a_s_curl_texturizergbd9w.pdfIn PDF document text
    • http://save50.pro/3d_pie_chart_template_excelcsm0t.pdfIn macro / runtime command snippet
    • http://all-system7.work/cyber_security_incident_reporting_rbiezbmc.pdfIn PDF document text
    • http://rodsfish.club/rulazj411d.pdfIn PDF document text
    • https://zoroxazug.weebly.com/uploads/1/3/4/6/134614170/5073684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fe1f72c58da1.pdfIn PDF document text
    • http://nodewunopula.iblogger.org/cognos_11_active_report_export_to_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/avantree_bluetooth_transmitter_user_manual.pdfIn PDF document text
    • http://nalujisutu.epizy.com/android_9_samsung_s8_verizon.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gozifep/familia_anacardiaceae.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/jajekekixevosamafisilotu.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/3869811730.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/canon_eos_rebel_xti_lens.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/carter_burwell_songs.pdfIn PDF document text
    • http://jifunujori.rf.gd/guzeki.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
    • https://s3.amazonaws.com/zifozujiwiIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 5844 bytes
SHA-256: 7a4514b6e80ade633881dfa541440f92bb424486826e3b5eb79b8f580403c422
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10632 bytes
SHA-256: 9618097b9154a00e8eb1891f88fd05dc6a86d2c0a352b69e61e28d372c5aec0f

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