Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e04a8eb37dc75fb…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 17:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 719082559ef60316a56fbc88177f69f4 SHA-1: b5306484cbb79b03e6f7468ddc9b0374dae47a9a SHA-256: 3e04a8eb37dc75fba4bd1cc9406fb71993e79f06728242f323b6dd8482d22ce1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=all+aix+commands+pdf PDF link annotation
    • http://betizekaxu.getenjoyment.net/rigivijoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6052c6b6c2372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_601f5f5ad90e7.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/firiwijoboduv.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/jezitejarezer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488335/normal_60005c7bc52d3.pdfIn PDF document text
    • http://bivaxopepukoxi.getenjoyment.net/catherine_millet_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fd7a71fa0348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5ff3b2fc84f33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_d7ea4e6e9b2f4a4ba1cb26973843afc6.pdf?index=trueIn PDF document text
    • https://22e44a25-5b44-49ab-8bd1-9de78d2943b2.filesusr.com/ugd/cce535_c08a5a32ca1e4f02953920d27178c44e.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_fba5e350811a428dafbfa5bb61dcfbe0.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_3a463dd619da4d72bca3c96af2f2cede.pdf?index=trueIn PDF document text
    • http://saxarivoje.onlinewebshop.net/amharic_english_dictionary_kane.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_5cf850b7418148dfb16ff35d7bef817f.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_d98dc45d78d846deac00963095f78844.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_0e395c399d0b4737939013a7cbc0f2e2.pdf?index=trueIn PDF document text
    • http://faxinodi.rf.gd/bikazexotogofige.pdfIn PDF document text
    • http://nakunefizuvodu.epizy.com/multiplication_worksheets_for_grade_4.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_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 5260 bytes
SHA-256: 3845cd51a4581af747acbb339cdf5866163ea9b7d9f6d7a715ce9a88b5db247a
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 11452 bytes
SHA-256: 9839cc100f75f2199cad3440ed509dd8954d429efc103739250494f4e4cc058f

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