Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebee0731274a763f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 05:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2fda31105f293327e9fc3f604b063dda SHA-1: 22ec43569c72a6a64436264dbed38a3591240991 SHA-256: ebee0731274a763f8998bf6c68541c24d3974558cb5194d86abc6d9b42527edc
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting a compromised site, potentially for credential harvesting or further payload delivery.

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://nipisod.ru/strik?utm_term=daily+reading+comprehension+grade+1+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5ff7d987b3b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd6256fdb51c.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/bafemifawezinem.pdfIn PDF document text
    • http://bilkan.fun/zisifimosixalolunesepisapsegb.pdfIn PDF document text
    • http://small-italy.space/private_lacrosse_training_near_me3g14s.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/hbuhhib/pocket_veto_definition_ap_government.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/babox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_6042aa693e62b.pdfIn PDF document text
    • http://world-wildshop.com/lemaxononoxijowafisewistni0y.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/espirometria_valores_normales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60388b0f719d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5ffc807338216.pdfIn PDF document text
    • http://gradstroy.su/92989613651v5c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6037995466e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6032d34c9a399.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/iT3hhYn/paralyzed_song_lyrics.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/sotefavagob.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/1dea0f8e-038a-4d1d-b987-977da7892bd4/19349098386.pdfIn PDF document text
    • http://jurizamumi.myartsonline.com/gawolabosepebepaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc3a667-8b9c-494a-b8db-3801a1391905/girl_interrupted_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff7daf2-8ac0-4e78-9280-7bce049f148f/keto_prepared_meals_delivery_uk.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5720 bytes
SHA-256: 81e88e5361dcc4cafba1606ac152e6300a201ec66f902240a902dc4af9983bb7
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10376 bytes
SHA-256: da5ae9e075fd58d411745da73a0926af2cf2e803c970bf1dedd0d5238abc5245

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