Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5284406cc53cbc7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 09:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e86d4a7f38341813a1fb360af7a4ed5f SHA-1: a6e92f924d70f7eee1b89fb3caddee6bf239efa0 SHA-256: a5284406cc53cbc7df851795472bfd7698987797dacf75aeae502e8227e22145
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an external URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The document's content, though heavily obfuscated, appears to be a lure related to 'minecraft mods unblocked at school'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware 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://golowaki.ru/wix?keyword=minecraft+mods+unblocked+at+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6040bc4344ee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_5fec1354f3ffd.pdfIn PDF document text
    • http://segorewadidet.iblogger.org/types_of_knots_fishing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_601e68bd2b54c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5fcf66ee6e5b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_600bd0519ecbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fe94e923cf79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_33ff57c81a6546ecb633d6acd691cb02.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_cf38834bc53d416391062e226c0ed5d4.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_2851bf38975f400882ef7d28bf3b1070.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d4ce51-f7b5-4285-8d14-a4764df57cbb/jekaxetemexemiponixovanu.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_d3d12aabaf224402afbb8b21e0e20c2b.pdf?index=trueIn PDF document text
    • http://zemadepa.rf.gd/certificate_of_conformity_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e6f844-8f7b-4eb0-a5de-b554879e2ac4/keeping_god_at_the_center_of_our_lives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197c81e7-c974-4fff-8fef-0b1c98979ba5/ladojorapususa.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/76214498247.pdfIn PDF document text
    • http://mukokulag.epizy.com/forklift_operator_written_test_answers.pdfIn PDF document text
    • http://mafatiwi.rf.gd/rokatuvupupebu.pdfIn PDF document text
    • http://dowewuzosibu.epizy.com/90550636353.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_60c99093b2c341c0a7549645f9d44136.pdf?index=trueIn PDF document text
    • http://lafebevu.rf.gd/11692523707.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5468 bytes
SHA-256: 0133e870f47343709cbae5cbfa07802488a9287fd01115dfc8e1a5a44306ce1b
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10972 bytes
SHA-256: fb1a111066b94c22d42d53bdf43a17b8725396931c075444ae601274090313ce

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