Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6922f85f0909e7…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 11:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 983e53122c18bb37c97ea53fd5b6115f SHA-1: 504fa9bbc35103e72574c8d53f692fd9a0906704 SHA-256: 4b6922f85f0909e79e4d4f50396fd902b6353cfc0c9c03d9cead5e18a1ec40e1
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=how+efficient+is+an+electric+fireplace PDF link annotation
    • http://lodomujimujug.mywebcommunity.org/saravewajepuradaxig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_601b3ab43cd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6058cdd753a9b.pdfIn PDF document text
    • http://labanom.22web.org/liwoxotixanajeru.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/banunigesavujijejivalemux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_605d9beb7c345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_6016cae463d91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fee3930869ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5fe356efc2745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd61e8008a2a.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/chemistry_foundations_dimensional_analysis_worksheet_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fed79081f819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_5feb4e8322cfc.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/catching_fire_novel_plot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_601b2c50c406a.pdfIn PDF document text
    • https://static.s123-cdn-static.comIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/75423124909.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/gibodunilijixirajagapu.pdfIn PDF document text
    • http://pobevejilu.rf.gd/jewivaxefemigiw.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8ad2b6-4cb1-4a20-962b-5dd663d2c344/how_can_i_get_tested_for_sleep_apnea.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/wekipumaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/auditora_contable.pdfIn PDF document text
    • http://faduribifojom.rf.gd/beats_studio_pro_wireless_bluetooth_earphones_earbuds.pdfIn PDF document text
    • http://kizufalugomux.atwebpages.com/daun_belimbing_wuluh.pdfIn PDF document text
    • http://gokamevagared.epizy.com/gezeborilisonekifewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c37912d-f0bd-4644-8677-ac2047079196/windows_10_powershell_on_startup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88a4ab9-b4bc-4bbc-996f-d34d9f603a4e/senovapis.pdfIn macro / runtime command snippet
    • 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_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 5064 bytes
SHA-256: d59bc7bac9abe211e9a3dc98fbfd430b3188284971a6d8d15d822b02ce4fa3dd
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10816 bytes
SHA-256: 812b58639c9aba0b1178e18335070e75f396fdc987a341cdfcb7908e94ed2086