Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0865e1eac98895…

MALICIOUS

PDF

73.8 KB Created: 2021-03-21 01:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03d6a96d20fd9efa7c9dc73a6fa199c4 SHA-1: e79ab0338b5d3bef130669ae0070f7d2c72363e6 SHA-256: bc0865e1eac98895d4254573ff4fdc9a6399ae78862d6cd48b8dae182de85a10
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn-cms.f-static.net/uploads/4476577/normal_602c45c72ba3a.pdf In PDF document text
    • http://jarewitof.mypressonline.com/lerosogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_601a7e7e1a059.pdfIn PDF document text
    • http://kernig.store/wow_mist_of_pandaria_horde_pvp_vendor4iwiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fda6be3bcde6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5fc6ba4f2843a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ff58d411907e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_6021483d9422d.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/capitalization_and_punctuation_practice_4th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_602e1007729a5.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/qbd_analytical_method_development.pdfIn PDF document text
    • http://paganel.world/shred_diet_cookbookl2n8r.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/antiemeticos_quimioterapia.pdfIn PDF document text
    • http://reawolt.online/13312187591xkvbu.pdfIn PDF document text
    • http://sewonmedix.ru/13658267369pm8td.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_603a53feeb5f0.pdfIn PDF document text
    • http://citrus-fruit.space/resumen_de_pelicula_la_leccion_de_augustxbfnb.pdfIn PDF document text
    • http://load-bcp.com/9692861374923a0n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_6010afc5f0ec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fc95d901130f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=ryobi%20ex26%20carb%20adjustmentPDF link annotation
    • http://patudesaruvob.atwebpages.com/snare_drum_practice_pad_with_snare_sound.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_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 5732 bytes
SHA-256: 265fd35886d399109fb8d206dd0ec99e4d20728c76ca1d074d518a6682ea1811
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10868 bytes
SHA-256: 21911f7f67f4e291cfdcb769b1eec266938bb557f6c81d67685be6c0c94e9959

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