Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b8bbabd8f4a8c…

MALICIOUS

PDF

82.9 KB Created: 2021-03-04 21:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f7b3e48bc2a7521c3d9d932a637900e0 SHA-1: 5084c18347a838a52648a3aecb6eb272843a3011 SHA-256: 8d5b8bbabd8f4a8cbddb5fa4e83078214fa286af7cd5d78c238b6243925d593c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though partially corrupted, contains text related to a Beethoven sonata, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=beethoven+piano+sonata+c+minor+op+13+path%25C3%25A9tique PDF link annotation
    • http://mynasert.online/watumezurdxp.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/30106703106.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/tenosezidubuv.pdfIn PDF document text
    • http://idealicacolumbia.site/acog_guidelines_gestational_hypertensionl1paf.pdfIn PDF document text
    • http://zuviferufudufa.iblogger.org/73167844801.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/go_tell_it_on_the_mountain_chords_easy.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/kevizasavawulixas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_c46b73a1f1df460899a402cd54a87140.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_16aa6a8757734472a45a39a072e8afe9.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_2720b65b5645452ca6e0e98d7353c2f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/vuroniwutatiwaropalake.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_4196d5e33ca4474a873acc9d9d11b420.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/what_religions_believe_in_free_will.pdfIn PDF document text
    • http://wumevagijez.epizy.com/netagatosomopawonurubalez.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_5633a2a5068049d9ab6c3f4a16fdd503.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_5b47613f79f5402db1299756925dbe4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/venumesedabenepawuwi.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/inverse_and_exponential_functions_answer_key_mvp.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_78f46bace36b4ef7b307786aa0f9148a.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_b71901d5d3114983a38e90f944e96c35.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_87fce0ffd3be4a96bd69bf83117b1834.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_c813903883ed4606907a787a12bfb6d3.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 5736 bytes
SHA-256: 01cd9f5957d40ea20ada282939cbd9a5827300bf1328854341f6c837cace0ea4
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 11152 bytes
SHA-256: 8e3097c105d4bf32472a6446a95b4f42a944aeaa89e39131a5bdf13311ea1723
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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