Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8456d47ec09ea6…

MALICIOUS

PDF

67.3 KB Created: 2021-05-15 11:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 49caa54bf54c6cf43079aff71316d4be SHA-1: 92db8882e19ce37dad351e5db85f179dd58ca8a7 SHA-256: 9a8456d47ec09ea61bdd6555ea33675d4cb3714108bd902d88ab98b324ca1f62
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, and contains numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to redirect users, and the presence of a UTM term in one URL suggests a phishing or tracking attempt. No scripts were extracted, but the overall structure and heuristics point to a phishing lure designed to redirect users to malicious content.

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://pelibifir.ru/strik?utm_term=the+human+body+an+orientation+answer+key+pdf PDF link annotation
    • http://limezage.scienceontheweb.net/93635903789.pdfIn PDF document text
    • http://registrat.space/2647081177d9l29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_606de5102c826.pdfIn PDF document text
    • http://a1metromovers.com/cloze_test_practice_with_answersue14u.pdfIn PDF document text
    • http://fiwuwoxas.22web.org/how_to_make_your_sims_in_labor.pdfIn PDF document text
    • http://fanogizakelime.iblogger.org/nubedasizubuvedujamopeja.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/64068843105.pdfIn PDF document text
    • http://ecosbor.net/89560269797gfdxz.pdfIn PDF document text
    • http://medtechnika1.ru/bufejikusewofemopaxovujixmqyf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_6057ecb6e1e6c.pdfIn PDF document text
    • http://begemotiks.fun/wizekav9aqgk.pdfIn PDF document text
    • http://it50off.pro/the_burnout_society_free_downloadp1xrs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxojit.epizy.com/xitezegipuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/jezitajurujofobomarofus.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/joining_report_sample_doc.pdfIn PDF document text
    • http://pupowelepidojek.onlinewebshop.net/carbozinc_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/la_crosse_wall_clock_manual.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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 5596 bytes
SHA-256: dc6bc8c5356b960b7c815b3351dd808667f1de2c66a4abefec85ddc6b09edff8
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 9792 bytes
SHA-256: 6264db20193c7749f52d991379270c39921d6b660375a0aa2a43d09bf9952d5b

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