Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f92c0102431b08…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 35e52fd0392f684fc9b350b9076a38e8 SHA-1: cd72a2d695b9a46ccc8a1596306c6a93041a78f5 SHA-256: 66f92c0102431b082d42620e188ad2143f22dcbb4d459804bde8b0b4289d6645
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://jumiwimov.ru/strik?utm_term=texas+instruments+calculator+won%2527t+turn+on PDF link annotation
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/e22dc720f.pdfIn PDF document text
    • http://popijizixoxovoj.iblogger.org/54326487528.pdfIn PDF document text
    • http://murerejomijuv.22web.org/79425838767.pdfIn PDF document text
    • http://healthit.space/61939022095txsms.pdfIn PDF document text
    • http://lasleymarkt.ru/jaxotibomazupiziv9600.pdfIn PDF document text
    • http://itslm.fun/bibel_altes_testament49hwq.pdfIn PDF document text
    • http://busevabafumoje.iblogger.org/sebupof.pdfIn PDF document text
    • http://sreview.online/es300_hybrid_review48aum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5feea20d22f83.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/naropen.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/8313901.pdfIn PDF document text
    • http://reduslim-shop.site/63344517972kdm0q.pdfIn PDF document text
    • http://tryraisins.pro/sasalepirenevawemibomfyy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_6028f61051a8b.pdfIn PDF document text
    • http://latuha.com/how_to_program_a_fleck_5600_sxt_water_softener6t2ot.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/358028916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5feb7f04bc27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fd82c8116bf3.pdfIn PDF document text
    • http://jopkapopka.online/tejinakudipazgid39.pdfIn PDF document text
    • http://zopaxonurur.iblogger.org/born_to_run_1993_movie_free.pdfIn PDF document text
    • http://lighterusb24.site/55232591381p1kuh.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/diril.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bapexuzajo.epizy.com/jasperreports_maven_plugin_compile_reports.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/vikiro.pdfIn PDF document text
    • http://wutasudi.epizy.com/holistic_nursing_a_handbook_for_practice_6th_edition.pdfIn PDF document text
    • http://jawevobafepen.epizy.com/videoder_apk_install_free_for_android.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_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 4972 bytes
SHA-256: cbc2e2be53cd4cddc22b275877bd21d41513807472daa69595c27716a2474660
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 11380 bytes
SHA-256: 74f6efeb9d5e26a89699a53902a574059c4f94fb305ea32f8a92e1bbe0d4c636
font_02_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f