Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acf2911ff0df6bd…

MALICIOUS

PDF

75.8 KB Created: 2021-06-04 07:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 695d2a034a06d60b1a8b1c231f689630 SHA-1: 287990562e4b06b7ed706f7fc5f4e911c48c1a41 SHA-256: 9acf2911ff0df6bdb93a27af614e0704e824180387024ad7b1ec5870fe23cc61
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL that redirects to a page with a 'utm_term' parameter, suggesting a phishing or spam campaign. The document body, though heavily obfuscated, appears to relate to financial processing, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/pbw?utm_term=how+to+process+credit+notes+on+sage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6039c3486dffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_6014494b028a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fdb1fa721abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_60192013d95a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_602584239ec68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_606df375a568e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fcb6e383ae76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_60355aedd47d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_6046fc7f01241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_60676700670c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_604af4fb26cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_6015407558ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff6a2493d35b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144578952/mortal_engines_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dcc900-87c2-497d-8b04-69c4eadb137f/harry_potter_book_review_goblet_of_fire.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144588732/qualities_of_a_good_english_teacher.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/pibuxugezebotuvuful.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144443538/pilot_study_in_dissertation_example.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/fomovizufadijefev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c215cb-9172-40fe-bc52-754591da8335/how_to_use_onenote_for_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23412003-f2fb-47cc-b2a2-12d73f29b76e/14957216646.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/putaveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3bf334-918b-4281-b6f9-90279836679a/how_do_i_update_my_tivo_bolt_software.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/esl_intermediate_christmas_reading_comprehension.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144467097/psicologia_del_mexicano_en_el_trabajo_mauro_rodriguez_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3690011-078b-4aa1-ac72-41abefb8d8b6/84832626299.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 5264 bytes
SHA-256: 9cb0515eab5afe21e761e7e28910da4669038b5121806b00adeb9746635f296f
font_01_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 10828 bytes
SHA-256: ec4b7bcb4fb2e20bca36c2253571cee8c0d990611bc71b181a425d655d345639