Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc58cdddc4ba4cde…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 10:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 752a93ddea3f2517141c26c7e6e552bb SHA-1: 9fa2ec3f3f4e5dba73b32c8583008c59e0b452f9 SHA-256: bc58cdddc4ba4cde8c7172a2b06bd5c8fbce14b986607f9ec19f44b68948192b
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary malicious URL identified is https://crophysi.ru/wix?keyword=not+your+mother%2527s+rules+pdf, which is likely used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=not+your+mother%2527s+rules+pdf In PDF document text
    • http://zamowafa.mywebcommunity.org/pavuwisexal.pdfIn PDF document text
    • http://naturfresh.space/valence_electrons__lewis_dot_structures_worksheetgrb5o.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/walef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_600f9eb560adf.pdfIn PDF document text
    • http://nadahul.ru/self_mind_control_techniquesy9fes.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/igcse_biology_practical_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_603798305202e.pdfIn PDF document text
    • http://fibilif.iblogger.org/garmin_forerunner_110_armband.pdfIn PDF document text
    • http://good-production20.site/xezatelomamimodokofedoma611ie.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/aluminium_doors_and_windows_manufacturing_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_60032628563e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_600f974174c13.pdfIn PDF document text
    • http://educationonline.website/drake_l4b_modsnflwu.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/analytic_geometry_notes.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/bopojedeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6588468e-4b63-435c-9935-d33031cb07ea/54701055504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57e585f-ee96-45ba-bdf1-5d88e584d214/kingdom_hearts_strategy_guide.pdfIn PDF document text
    • http://bebidexaroz.rf.gd/dublin_bus_app_apk.pdfIn PDF document text
    • http://bemabam.myartsonline.com/wategikoput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad31c05-25b0-4ab1-8921-de842f368332/learn_r_programming_free.pdfIn PDF document text
    • http://jizemefuzix.epizy.com/free_carfax_report_dealership.pdfIn PDF document text
    • http://gafijid.atwebpages.com/77022959801.pdfIn PDF document text
    • http://melufisagaw.epizy.com/beretta_92x_performance_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f112843d-13a5-47b0-87e3-304eac4fa296/safety_cast_vs_real_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77153ad-3f26-46a7-8c3b-92897ad1c728/52884011320.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5176 bytes
SHA-256: 0494ec513628567d9abe1aec335d2c5d90ca14c8a416f086172ff56014ac3469
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 11144 bytes
SHA-256: 82eb89713695305612a1ddb874751536b51a7b9274d57da090dec132c8beb64a