Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9973da5680d8a6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 20:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf3875f59936df746a3aecad6caca69 SHA-1: 261dcd2f68a869d84827047b8d9d3db72da19d6d SHA-256: 6a9973da5680d8a6e88badaae4b01dfb1994ded505abd669ba6f4800afdd700f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the sheer volume of external links and the detection results point to a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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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