Malicious PDF — malware analysis report

Static analysis result for SHA-256 9500b4382d87e853…

MALICIOUS

PDF

77.6 KB Created: 2021-03-02 20:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e59c93fe3119c3b60b3e3fd7371a30e2 SHA-1: 2554230c65ee653590e20e96d4aee6c8eccb1b40 SHA-256: 9500b4382d87e8530a7ea7942fbf46ae9777beb2a7fbc91b421ef2502296ce9b
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one prominent URL suggesting a schedule-related lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, pointing towards a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=lirr+schedule+today+delays PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443357/normal_600e76a8659cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff61ca3d8b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fcdaf2c17a3c.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/ghi5agh/vepidugije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fea2f007dd09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5ffa8372bc0ad.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/jfkwKta/33116289651.pdfIn PDF document text
    • http://sakajutapud.22web.org/jadenulozemogataj.pdfIn PDF document text
    • http://hookup154.space/49388582642adz69.pdfIn PDF document text
    • http://aviabileti.ru/project_communication_plan_template_excel_free5p3qn.pdfIn PDF document text
    • http://luminar4-download.xyz/how_to_show_data_table_in_chart_excelil036.pdfIn PDF document text
    • http://dithetsen.xyz/digital_marketing_course_in_delhi_ncrdybrv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5fef673382064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6039c39c706d0.pdfIn PDF document text
    • https://cdn.sqhk.co/jadosoxiko/iRgchgh/tibunoriwajo.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/6INS3id/cross_the_road_jokes_for_adults.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokezaja.epizy.com/gilapejinogedetosexomamu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/lotozunuwosumotojivejo.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/android_smartwatch_vs_apple_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/83978189420.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/dometic_rv_refrigerator_fault_codes.pdfIn PDF document text
    • http://zifezerolivuba.epizy.com/ximikulek.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/social_media_platform_l_g.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5072 bytes
SHA-256: 9ec4d6d8fb0ccfcca4667d19600ecf2b1c45e4d5675d9139029c1f66d431dec3
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 2244 bytes
SHA-256: 89dd8ee0fc2ae7e7933c19bc61fb783b7734f08b61cf2f83ac652309661a3e3a
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 11200 bytes
SHA-256: 30f6a363728aa9bb3b40f9c6dba265aa3390b53d5981e4c62e33d31cada888e5

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