Malicious PDF — malware analysis report

Static analysis result for SHA-256 4839ca69c9d83c3c…

MALICIOUS

PDF

86.8 KB Created: 2021-04-25 10:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b17c93faa4f55ca920c9d7380b5e300 SHA-1: d24a77fa600c1ebaba67c771747581f8cf2572dc SHA-256: 4839ca69c9d83c3c77acb2c4d0e9fb6c9995cad46d46f95dbdc1bf15a5fa2295
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though truncated, suggests a lure related to a literary summary. The embedded URLs point to suspicious domains, likely serving as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=by+the+waters+of+babylon+by+stephen+vincent+benet+summary PDF link annotation
    • http://wiwovurezibaso.getenjoyment.net/15058100068.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/celestial_objects_for_common_telescopes.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/88024765270.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/81064711647.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/mezozoriwirisodoxoxa.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/dimudejekeloxenokiza.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/baixar_livro_antes_de_partir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409102/normal_5fddf7cbb14e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fcfb6428b5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_606e110d30a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd0ff461ef3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fdc45ee79c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_6038ddfc54a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_602ca1a93e2bb.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/34232165168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fd81f9e41f2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patilawasu/filejoba.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/sap_fico_accounts_payable_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/brazil_vs_germany_2014_full_match.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_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 5696 bytes
SHA-256: f87df859ded6bfc523229966b74d23de6ac8e4f11c9cd09ed2ba4e1f9b44fe4e
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 11576 bytes
SHA-256: d17d0f4d30e95f6eab38ac69ee88c0a0cb704401761cca69dc8ac19c36206d36

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