Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26c9b88c8c71a1e…

MALICIOUS

PDF

117.4 KB Created: 2021-03-09 23:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd54f386e6b824166dea21f869605e67 SHA-1: 7b57284130d9654b09186911472477cfdff8d981 SHA-256: e26c9b88c8c71a1e936d8e747e8842561bf985616aba374687422028006954d6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=neoclassicism+literature+pdf
    • https://cdn.sqhk.co/jesotipo/DdjfheV/89350610705.pdf
    • http://fullpisetc.ru/7440678202vmk7a.pdf
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60123662ec169.pdf
    • http://sweetygirl.club/how_to_reset_service_engine_soon_light_nissan_pathfinder_2001uf7sl.pdf
    • http://hocostyle.ru/brave_souls_mod_apk7zfr1.pdf
    • http://shopsupergood.site/a_study_in_scarlet_summarykds1d.pdf
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5ffc8ebe7812d.pdf
    • https://cdn-cms.f-static.net/uploads/4404497/normal_600f1e9ed692d.pdf
    • http://construt.site/year_7_printable_7th_grade_english_worksheetslriec.pdf
    • http://laketofetujeso.medianewsonline.com/hallelujah_chorus_messiah.pdf
    • http://lirebuwoke.mygamesonline.org/74001514017.pdf
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fe23e5a7ab6b.pdf
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601e2a47c6424.pdf
    • https://cdn.sqhk.co/vadetegubufo/mXtjcck/93763831293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27e999f8-a7e8-4751-a282-e3dc72dc8ccf/project_management_skills_summary_resume.pdf
    • https://s3.amazonaws.com/vovopafubipu/sojotivigokeg.pdf
    • https://s3.amazonaws.com/medaliwifufugel/69271844417.pdf
    • https://uploads.strikinglycdn.com/files/7cde18cc-7755-4cb4-8b9c-9c12574738d3/the_last_jedi_script_springfield.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/juruvukadepixonudefem.pdf
    • https://s3.amazonaws.com/zuwimadaneb/kuvufusodajozo.pdf
    • https://s3.amazonaws.com/ragejufa/how_many_calories_in_a_sonic_medium_chocolate_shake.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e61.bin
9133e4507ee47f6f49b2f3e8f81ebc2a8f3783c54e98755cbe4ab102dd087f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E61 5268 bytes
font_01_sfnt_off0001a03a.bin
c4da23b479a579948643d09a4a36dd3086c4e9f27d852daf33fa4cef5c19c683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03A 12188 bytes

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