Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d849b9fd41f0db0…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 20:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75ab96fdc2e729c2731f5d420b53ed5a SHA-1: ecdf61833262c4798370f6899f26d970913f5970 SHA-256: 7d849b9fd41f0db099c03922bbd502c356826458ac6db4bbd7f64a2698ad0da8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://crophysi.ru/award?keyword=calendrier+liga+2020+et+2020+pdf
    • https://cdn.sqhk.co/vunebegawiwa/ggdha5T/jerejetikatududut.pdf
    • http://ruvujagefeko.mygamesonline.org/eiffel_65_blue_piano_sheet_music.pdf
    • http://livemavuxedu.getenjoyment.net/guwadilaratolazawit.pdf
    • http://fekosuse.getenjoyment.net/mizapunomonobuli.pdf
    • https://cdn.sqhk.co/genizataxom/WDWjc22/nenopowujisagine.pdf
    • http://fonudesuwobulud.mygamesonline.org/zufum.pdf
    • https://cdn.sqhk.co/kifuzopeko/gflgejd/archery_champ_2019_master_challenges.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guwutivupudutu/ielts_academic_practice_test_6_reading_answers.pdf
    • https://s3.amazonaws.com/mamibis/xopad.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_b0dd03b3e0ce444fa3ad4ac4240d541a.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3df19704d0364fe2b3168898debc2bc9.pdf?index=true
    • http://xowobovu.myartsonline.com/roxezi.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_cee06ca4544b411d955555ad8e0c1880.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_a4ae2d65de444198acbe3ffcda976223.pdf?index=true
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_cf8d36179c6b4b618555b61fd3aeffc8.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_4f0ebb2f31064dc19671ca8d7ba2aba3.pdf?index=true
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_6702fa36f09747999c341a69f126c0f2.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_25fe174674034b90b86bd72fa22102f5.pdf?index=true
    • https://s3.amazonaws.com/vavale/88633103719.pdf
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_c061c317c7964df4a7baa231f067992e.pdf?index=true
    • http://zuvuzevo.atwebpages.com/75266236385.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin
0f98b8b816d82b89307bb7c85e6b20e1347606247d2057bf5c308f9d8352d72f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5212 bytes
font_01_sfnt_off000108c0.bin
310b7cc9797313b9cc7163fb1e5f44f24b6cef63cdd91b092e085ac3c273fcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 11292 bytes

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