Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f07cebd869470f…

MALICIOUS

PDF

87.3 KB Created: 2021-03-15 12:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3ed9345da36bd775ffa8f2c5691109 SHA-1: 1fb724915895563379d428ffc8858747e90f7617 SHA-256: d8f07cebd869470f8627bcba1618dac5b644b078de640635a0d07e5978c2ee2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link farm pointing to external PDFs. The primary malicious URL identified is 'https://resalured.ru/award?keyword=centaur+5e+ravnica+pdf', and another suspicious URL is 'http://xekuluw.iblogger.org/susot.pdf'. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=centaur+5e+ravnica+pdf
    • http://xekuluw.iblogger.org/susot.pdf
    • http://laithub.pro/when_breath_becomes_air_audiobook_vktjp2q.pdf
    • http://vermono.site/30409860835f3nx2.pdf
    • http://sdfafq.info/what_is_the_most_common_job_in_colombiayiksq.pdf
    • http://domsale.xyz/suxiraruketodstq.pdf
    • http://fagutoje.22web.org/76586080331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_77f94ddd6f244e42961ebeae15d73297.pdf?index=true
    • http://xawukagolu.epizy.com/ammyy_admin_3._6_software_free.pdf
    • http://namepafubi.atwebpages.com/46371307828.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_4237a225775f47cf84e08426311aa6d4.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_f43a52c2814343c38a915dfe7b17324b.pdf?index=true
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_ea5c5fc807ef4938b97c940612673151.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_129061202d5d40d0af81fdc262df11f8.pdf?index=true
    • http://selaxarizipa.rf.gd/south_america_map_blank.pdf
    • http://wolobugoxew.myartsonline.com/why_does_my_compressor_not_build_up_pressure.pdf
    • http://pabixezo.rf.gd/can_you_use_google_play_on_amazon_fire_tablet.pdf
    • http://xijejuvi.myartsonline.com/togese.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_59c89d03f0ea49288018867f460c3345.pdf?index=true
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_b9de689422c442c28a663fb4a3d4cf9f.pdf?index=true
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_b1cae920b1ef4a72ba0cbd6101a684f2.pdf?index=true
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_c0eff42993644446be6ff878044b9af7.pdf?index=true
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_dc79901919f042a697ffbf27c678bc0e.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_687d0755468342f48c7fb3b01c90ca1f.pdf?index=true
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_e74fafcd59e74a2a94ff429275241097.pdf?index=true
    • 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_off00011981.bin
90bc1a5a27b2476b224bca81b1e2cccf3e453bce2d731f0f4482481537605ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 5028 bytes
font_01_sfnt_off00012ab9.bin
aa687b5a1b19f05cde29642ce1fe5ee12a5925365b334479363dc69aa9518600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 10952 bytes

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