Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36053f158ac5812…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 05:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 013e6d838ad6147ed51d278f9597d609 SHA-1: 1ae1b34e768f159506a490fb19f88621348e248c SHA-256: b36053f158ac5812b543b098f019c8b506cf649baff10e4c3eaa9933f37126be
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=the+girl+who+could+fly+reading+level PDF link annotation
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/d66f0a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_60360edfcd02b.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/bajejever_goxixoposowom_wibetakokirapow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_5fe9ad6f8e1b2.pdfIn PDF document text
    • http://a1metromovers.com/rufelarakabafejo61cjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_60254fea338b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_6028b636a1abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5fd7cfaad2e2e.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/pasiwoxigamumem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602921234c040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naximeb.rf.gd/sql_visual_quickstart_guide.pdfIn PDF document text
    • http://molutuganum.epizy.com/niwekaxeguxex.pdfIn PDF document text
    • http://xuwedumod.epizy.com/allergic_bronchopulmonary_aspergillosis_guidelines.pdfIn PDF document text
    • http://zedorufusoli.rf.gd/excel_template_gantt_project_planner.pdfIn PDF document text
    • http://zopopujeji.rf.gd/superannuation_application_form_nz.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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 5308 bytes
SHA-256: fa9480ec5d1acb69763db865b3e3bbd267558148d8a44b9e148b95f39b11b5ad
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10368 bytes
SHA-256: 901f671b38934d440a85bea319059c49b3a7663407673a3b67576d86be2e4082

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